2. Suppose you burn magnesium in a limiting amount of oxygen in a closed system,
expecting to get 1.61 g of MgO. You measure only 0.988 g MgO after the reaction.
Show how you would calculate the percent yield for this reaction. (2 pts)

The empirical formula for the hydrocarbon is CH₂O.

First, we assume that we have 100g of formaldehyde

According to the question we have 40.0% of carbon, 6.70% of hydrogen, and 53.3% of oxygen. With help of this, we calculate the moles of individual elements.

Moles of C = 40.0 g of C × 1 mol of C / 12.01 g C = 3.331 mol C

Moles of H = 6.7 g of H × 1 mol of H / 1.008 g H = 6.65 mol H

Moles of O = 53.3 g of O × 1 mol of O / 16.00 g O = 3.331 mol O

To get the molar ratio we divide all the moles by the smallest moles which are 3.331. From here the ratio comes out to be C: H: O = 1:2:1.

Thus the empirical formula is, CH₂O.

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Answer:

universal in nature while applied research is limited in nature.

Explanation:

A pedigree chart shows Inherited traits in a family; the correct option is C

A pedigree chart is a chart that shows how traits are passed on from parents to offspring.

A pedigree chart is used in the study of inheritance or genetics.

A pedigree chart can for example be used to study the inheritance pattern of traits such as sickle cell anemia. In such a pedigree chart, the genotype of the parents is used to study how the trait is being transferred and can also predict the likelihood of the offspring of the parents inheriting that trait.

A pedigree chart can also be used to backtrace how a particular trait came into a particular family.

In conclusion, a pedigree chart is a chart that shows how traits are passed on from the parents and offspring of a family.

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The three samples of an ideal gas, all at the same temperature, occupy identical containers with the same volume. the particle mass is proportional to the  size of particles.  the gas samples has the greatest pressure is in which has greater no. of moles.

The equation for an  ideal gas given as :

P V = n RT

where,

P = pressure

V = volumes in L

T = temperature at K

n = moles

R = 0.082 L atm / mol K = gas constant

since volume and temperature are constant , then :

P = n

therefore greater the number of moles , greater will be the pressure.

Thus, The three samples of an ideal gas, all at the same temperature, occupy identical containers with the same volume. the mass of the particle is proportional to its size.  the gas samples has the greatest pressure is in which has greater no. of moles.

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The amount of oxygen formed when 6.54 grams ammonium perchlorate reacted is 0.89 grams.

The balanced chemical equation of the reaction of ammonium perchlorate is,

2NH₄ClO₄ → N₂ + Cl₂ + 2O₂ + 4H₂O

From the reaction it is clear that,

2 moles of ammonium perchlorate = 2 moles of oxygen

Moles of ammonium perchlorate = Moles of oxygen

Moles = Formed/reacted mass/molar mass.

Molar mass of Ammonium perchlorate is 117 g/mol.

Molar of oxygen is 16 g/mol.

Mass of NH₄ClO₄ is 6.54 grams.

Putting values,

6.54/117 = formed mass of oxygen/16

Formed mass of oxygen = 0.89 grams.

So, the mass of oxygen formed is 0.89 grams.

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The statement that is true about the two isotopes is that carbon-12 has fewer neutrons (option D).

Isotopes are any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.

Based on the above explanation, this means that isotopes have the same atomic number but a different mass number.

According to this question, two isotopes were given as follows:

Carbon-12 and Carbon-14 both have the same number of protons of 6, however, they contain different number of neutrons. Carbon-12 possesses 6 neutrons while Carbon-14 possesses 8 neutrons.

Therefore, it can be said that Carbon-14 has more neutrons than Carbon-12.

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We interrogate the equilibrium,

S=2.32×10−4⋅mol⋅L−1

what is solubility?

Solubility in chemistry refers to the capacity of one material, the solute, to create a solution with another substance, the solvent. Insolubility is the solute's inability to create such a solution.

The extent of a substance's solubility in a certain solvent is commonly assessed as the concentration of the solute in a saturated solution, one in which no more solute can be dissolved.

At this stage, the two compounds are considered to be in solubility equilibrium. Some solutes and solvents may have no such limit, in which case the two substances are said to be "miscible in any amounts."

We interrogate the equilibrium

Mg(OH)2⇌Mg+2  +2HO−

And Ksp=[Mg2+][−OH]2

And now if we call the solubility of Mg(OH)2 S, then by definition, S=[Mg2+], and 2S=−OH.

And thus Ksp=S×(2S)2=4S3

And so (finally!), S=3√Ksp4

S=3√5.0×10−114=2.32×10−4⋅mol⋅L−1

so therefore the solubility was found to be 2.32×10-4.mol.L-1

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The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

The equation for the reaction is :

KHP   +   NaOH   ----->  KNaP     +    H₂O

number of moles of NaOH = volume in L × molarity

                                             = 0.0360 × 0.100

                                             = 0.0036 mol

moles of KHP = moles of NaOH = 0.0036 mol

mass of KHP = molar mass × moles

                     = 204.2 × 0.0036

                     = 0.735 g

percentage of purity KHP =( mass of pure KHP / mass of impure ) × 100 %

                                          = (0.735 / 0.758 ) × 100 %

                                          = 96.9 %

Thus, The titration of an impure sample of KHP found that 36.00 ml of 0.100 m NaOH was required to react completely with 0.758 g of sample. the percentage % of KHP in this sample is 96.9 %.

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Since KCl has the highest molar mass when it is added to water, it will have the most amount, in grams, if the freezing point of each aqueous solution is the same.

An essential accumulative feature of the solution is a depression in the freezing point. This is signified by: T=Kfm. Here, the symbol for freezing point change is (T). Additionally, m is morality, and Kf is the freezing point constant. One of the matter's physical characteristics is its temperature.

1) Options list:

A. (NH₄)₂CO₃

Ionic Equation:

(NH₄)₂CO₃ → 2(NH₄)⁺ + {CO₃}⁻         [i = 3]

B. KCl

Ionic equation:

KCl → K⁺ Cl⁻          [i = 2]

D.NH₄Cl

Ionic equation:

KCl → K⁺ Cl⁻          [i = 2]

F. NaCl

Ionic equation:

NaCl → Na⁺ + Cl⁻        [i = 2]

G. CH₃OH

Ionic equation:

CH₃OH → CH₃⁺ + OH⁻             [i = 2]

H. MgCl₂

Ionic equation:

MgCl₂ → Mg² + 2Cl⁻           [i = 3]

2) Utilizing the formula

ΔT = iKᵇmsolute

ΔT = iKfmsolute

ΔT = T° - T

Here, T° is both the solution's temperature and the temperature of the pure solvent.

Suppose that T° is zero.

ΔT = 0 - T = -T

The greater negative the temperature, the lower the freezing point. The freezing point of the solution is lowered when a solute is added to the solvent. The formula states that a lower molality gives a solute the ability to be added to a greater extent and produce a smaller change in temperature.

To obtain a smaller shift in temperature, the molality should be the lowest possible. The quantity of moles of solute in one kilogram of solvent is referred to as molality.

Morality = (Number of moles / 1) * (1 / Mass of solvent in kg)

Morality = (Mass of solute / Molar Mass of solute) *  (1 / Mass of solvent in kg)

In this case, the solvent weighs 0.5 kg (constant)

Morality ∝ (Mass of solute / 1)

OR

Morality ∝ (1 / Molar Mass of solute)

With a smaller mass of a material or a larger molar mass of a solute, the molality will be lower. Only the solvent's freezing point and the solute's molar mass are under control under the given conditions. Despite the fact that KCl has a higher molar mass than (NH₄)₂CO₃, (NH₄)₂CO₃ will produce more ions at 100% dissociation than KCl. As a result, there will be fewer moles for the KCl.

The amount of KCl in grams will be the highest since it has the highest molar mass when it is added to water.

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COMPLETE QUESTION:

Six solutions are made by dissolving a certain amount of each of the six substances in 500. g water. If the freezing point of each aqueous solution is the same, which substance is added to water in the largest amount, in grams? Assume all ionic compounds dissociate 100% to form ions in the solution.

ΔT = iKbmsolute ΔT = –iKfmsolute

Select one:

A. (NH4)2CO3

B. KCl

C. The largest mass (g) of substance added is the same for two of the solutions.

D.NH4Cl

E. Insufficient information is provided.

F. NaCl

G. CH3OH

H. MgCl2

The correct answer should be "B" or KCl, but I don't understand why

At this point, helium is exerting 1270 torr of pressure against its container.

Boyle's Law, a cornerstone of chemistry, describes the behavior of a gas sustained at a constant temperature. Robert A. Boyle discovered this law in 1662: at a certain temperature, the volume of a gas is inversely proportional to the pressure it exerts. To put it another way, if a gas is driven into a closed place, it will condense to fit the area but raise the pressure on the container.

Boyle's law, which is arguably a clearer way to put it, is the relationship between pressure and volume. Mathematically, Boyle's law can be written as pV=k, where p stands for the pressure, volume, and mass of the gas and k is a constant.

The solution is straightforward when temperature and moles are constant,

P₁V₁ = P₂V₂

Given,

P₁ = 760 torr

P₂ = ?

V₁ = 5.00 I

V₂ = 3.00 I

(760)(5.00) = (3.00)(P₂),

P2 = 1270 torr.

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Answer:

the answer would be more than 2.5g

Explanation:

1. Heat energy is absorbed

2. The amount of heat absorbed is 25104 J

1. How do I know if heat is absorbed or released?

From the question given, we can see that the temperature of the water moved from 10.0°C to 40.0 °C. This simply means the water absorbed heat to increase its temperature.

2. How do I determine the heat absorbed?

The heat absorbed can be obtained as follow:

Q = MCΔT

Q = 200 × 4.184 × 30

Q = 25104 J

Thus, the heat absorbed is 25104 J

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Copper(i) iodide added to table salt as a dietary source of iodine. 0.238mm of CuI are contained in 1.00 lb (454 g) of table salt containing 0.0100% CuI.

Mass per mole is a definition of molar mass. Molar mass is the total mass of all atoms in substance that makes up a mole. It is measured in gram-per-mole units.

In the case of single elements or individual atoms, the molar mass is just the element's mass given in atomic mass units. Atom's atomic mass and molar mass are exactly equal.

Given,

Mass of table salt is 1.00 lb = 454 g

Copper(I) Iodine (CuI) present in the table is 0.0100% by mass or

CuI present in the 1 pound of salt = 0.01% of 454 g = 0.0454 grams

Now,

Molar mass of CuI = 63.54 grams + 126.90 grams

Molar mass of CuI = 190.44 grams

∴ number of moles of CuI present in 1 pound salt = Mass / Molar mass

Moles of CuI= 0.0454 / 190.44

Moles of CuI = 2.38 × 10⁻⁴ moles

Moles of CuI = 0.238 millimoles

∴ Moles of CuI present is 0.238mm.

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An amino acid with a carboxylic acid group is glutamic acid. This sends forth a bad vibe. Additionally carrying a negative charge are the phosphate groups that are added to a protein during phosphorylation.

An iron binder called nitrous acids is used to treat potentially fatal acute cyanide poisoning. To treat arsenic poisoning, silver nitrate solution is combined intravenously with hydrazine hydrate (as sodium nitrite).

Nitrous acid is an unstable, barely acidic substance. It is a nitrogen oxoacid. It is made by treating nitrite salt and mineral acid to make it acidic. Oxidant and nitrous gas are combined to create nitrous acid, which contains less oxygen than nitric acid.

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The % ionization of a 2.00 m aqueous solution of the base is 0.0022%

What is pOH ?

It is a measure of the hydroxide ion (OH-) concentration of a solution. Therefore, it can be used as an indicator of the alkalinity of a substance and, in some cases, also as an indicator of electrical conductivity. pOH is the negative logarithm of hydroxide ion content and is given by the formula:

pOH = 14 - pH

OH = Kw /OH+

where Kw = self-ionization content of water.

Applying the logarithm on both sides, the more general form of the equation is: In relation to corrosion, pOH can be used as an indicator of electrolyte conductivity in galvanic cells. The conductivity of a solution depends on the concentration of ions that act as charge carriers. The higher the concentration of OH ions, the stronger the alkalinity, the higher the conductivity of the electrolyte, and the higher the rate of galvanic corrosion.

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Using the ideal gas equation, the volume of the gas is  0.84 L.

We know that an antacid does react with the acid in the stomach and that one of the products of the reaction is the carbon dioxide gas as we can see from the reaction equation; CaCO₃ (s) + 2 HCl (aq) → CaCl₂ (aq) + H₂O (l) + CO₂ (g).

If 1 mole antacid molecule produces one mole of carbon dioxide;

Number of moles of antacid = 3.32 g/100 g/mol = 0.0332 moles

Volume of the gas = ?

Number of moles of the gas =  0.0332 moles

Temperature of the gas = 37.0 °C + 273 = 310 K

Pressure of the gas =  1.00 atm

Given that;

PV = nRT

P = pressure

V = volume

n = Number of moles

R = gas constant

T = temperature

V= nRT/P

V =  0.0332  * 0.082 * 310/1.00 atm

V = 0.84/1

V =  0.84 L

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Because of Emulsion, when we store hand cream for a week its oil and water get separated.

Water and oil are necessary to make hand cream. water is an emulsifying agent.oil and water mixtures are emulsions when shaken together.The oil will form droplets and dispersed throughout the water.In this process,the most necessary is to mix the oil and water properly.The content of the ingredients may have been miscalculated or the temperature of the water is not enough.

Emulsifiers are added to hand cream.This is based on chemicals phospholipids.These are obtained from plants,nuts,berries ,leafs etc.

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Answer:

Explanation:

This practical can be used to introduce the idea that the relative amounts of a fuel and oxygen (from air) are important in combustion, and that there will be an optimum ratio in which the two substances react. This leads on to the idea of chemical equations.

In the case of a class experiment, where students generate the hydrogen themselves under strict supervision, all the hydrogen generators must be collected once the test tubes have been filled and before any flames are lit, to prevent the possibility of accidental or deliberate ignition of the hydrogen in the generator. This has caused a number of accidents in the past. Alternatively the test tubes could be filled with hydrogen beforehand, or by students under supervision, from a steady cylinder supply.

0.936g is the theoretical yield of water

CO2 molecules = moles x Avogadro's number.

= 01034644x 6.022x1023

(2·0866 X 1022] (approx)

1 moles of O2 produce 6 moles of 420 from breath.

Theoretical 4x01060627 yield of H2O = Males of H2O X Molar Mass = 0.060627 moles of 02 generate.

= 0.051966 moles

10.051966 X 18.01528

0.936g

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Answer:

What property of the wave is addressed by the letter B?

Picture result for The letter "B" is marking which part of the wave? B Frequency Pressure Rarefaction Plentifulness

What property of the wave is addressed by the letter "B"? Abundancy.

Explanation:

1,Wavelength,

Definition: Frequency can be characterized as the distance between two progressive peaks or box of a wave. It is estimated toward the wave.

2,Compression,

pressure thing [U] (Go ahead)

the demonstration of squeezing something into a more modest space or coming down on it from various sides until it gets more modest: Structural powers caused pressure in the world's outside layer.

3,Rarefaction,

At the point when rarefaction happens, the particles in a gas become more fanned out. You might run over this word with regards to sound waves. A sound wave traveling through air is comprised of exchanging areas of higher and lower thickness. The areas of lower thickness are called rarefactions

4,Amplitude,

At the point when rarefaction happens, the particles in a gas become more fanned out. You might go over this word with regards to sound waves. A sound wave traveling through air is comprised of substituting areas of higher and lower thickness. The areas of lower thickness are called rarefactions

I don't know much but I hope I helped you even a little bit.

When hydrochloric acid dissolves in water, the hydronium ion is created. Analyzing the developing bond modifications is helpful. Hydrochloric acid is acting as an acid, and water is acting as a base. Take into account the variations in bonding between the raw materials and the finished goods.

The hydronium ion (H3O+) observed in the products was produced by joining one of the oxygen atom's lone pairs to a hydrogen atom. A chloride ion was created as a result of the hydrogen-chlorine bond in HCl being broken and the electrons in this bond turning into a lone pair on the chlorine atom. The overall charge of the reactants is the same as the overall charge of the products.

This demonstrates how the new H-Cl bond is created by joining an electron-poor hydrogen atom of the hydronium ion to a lone pair of electrons from the electron-rich chloride ion. The oxygen-hydrogen link breaks because hydrogen can only make one bond, leaving the electrons of the oxygen atom with a lone pair.

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A piece of wood is measured and 1/4 of its 14c has decayed into 14n.  The half-life of 14c is 5,730 years. Approximately 5,730 years old is it.

The half-life is the time required for a quantity to fall to half of its starting value. The expression is commonly used in nuclear physics to describe how quickly unstable atoms decay radioactively or how long stable atoms remain. The term can also be used more generally to refer to any type of exponential decay.

A measurement of a piece of wood reveals that one-fourth of its 14c has converted to 14n.

With a half-life of 5700 30 years, radiocarbon (14C) is particularly useful for dating in archaeology. The Gamow-Teller ß-decay, an uncommon impediment to the beta decay of 14C to 14N, causes this half-life to be short.

Radiocarbon dating, also referred to as carbon-14 dating, is a method of radiometric dating. It uses the naturally occurring radioisotope carbon-14 (14C) to estimate the age of items containing carbon up to a maximum of 58,000–62,000 years. Carbon has two stable, nonradioactive isotopes: carbon-12 and carbon-13. On Earth, trace amounts of the unstable radioactive carbon-14 (14C) are also present. Carbon-14 has an extremely short half-life of 5,730 years due to radioactive decay to nitrogen-14, which means that within this time, the percentage of carbon-14 in a sample will have dropped by 50%. Carbon-14 would vanish from Earth's atmosphere in less than a million years if it weren't for cosmic rays that are continually pelting the stratosphere and interacting with nitrogen molecules (N2) and single nitrogen atoms.

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Average rate of formation of products  = 1/n (Change in concentration /Time rate) = -Average rate of consumption of reactants.

What is Chemical reaction ?

There are chemical reactions taking place all around us. Nothing could be further from the reality, despite the fact that we occasionally link chemical processes with the sterile surroundings of the test tube and the lab. A staggering, nearly incomprehensible variety of new substances and energy changes actually result from the enormous number of alterations that occur in our environment every second of every day.

Chemical reactions happen whether or not you want them to in nature, where they can be considerably less controlled than in a lab. They can also be more messier. Whether it be a forest fire that is blazing.

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The method can be used to visualize lipids that have been separated by thin-layer chromatography by reversibly reacting with double bonds in fatty acids in iodine fumes.

Chromatography on silica-impregnated paper is a very useful and versatile analytical method. Thin-layer chromatography is considered one of the most effective and versatile techniques for separating intact complex lipids and their lipid moieties as well as neutral lipids.

Solvents play an important role in both pathways as lipids are extracted using solvent-based techniques. In some cases the solvent is incorporated directly into the cell pellet, in others, the solvent is used during cell disruption. The separation and identification of unsaturated fatty acids are commonly performed by bromination or hydroxylation processes that convert unsaturated acids to the corresponding Bromo- or hydroxy-derivatives of saturated fatty acids.

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The ΔG at 298K of the given reaction is -304.08kJ/mole.

Combustion is a high-temperature exothermic redox chemical reaction between a fuel and oxygen oxides. Photosynthesis is an example of an involuntary reaction. Plants absorb water and carbon dioxide. But for it to change, it needs sunlight. This is an involuntary reaction.

calculation:-

ΔG  = ΔH -TΔS

Hence,

= (-733.8-393.5+824.2+110.5) - 298*(445.5+213.6-87.4-197.6)/1000

= -304.08kJ/mole

A spontaneous reaction is one that promotes the formation of products under the conditions under which the reaction occurs. A roaring campfire is an example of a natural reaction because it is exothermic. Processes that are spontaneous in one direction under certain conditions are not spontaneous in the reverse direction. For example, at room temperature and normal atmospheric pressure ice naturally melts but water does not naturally freeze.

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Silica gel and alumina are the most often utilized adsorbents. A wide range of chemicals, including hydrocarbons, alcohols, ketones, esters, acids, azo compounds, and amines, are separated using silica gel.

Because of its outstanding separation capabilities, the Silica Gel G for Thin Layer Chromatography as binder is most commonly employed as an adsorbent in thin-layer chromatography.

Silica gel is a porous and amorphous type of silicon dioxide composed of an uneven tridimensional structure of alternating silicon and oxygen atoms with nanometer-scale holes and pores. The spaces might be filled with water or other liquids, or they could be filled with gas or a vacuum.

Silica gel is a desiccant, which means it is a drying agent. Its purpose is to absorb moisture and condensation from its surroundings. It is a very efficient and cost-effective method for businesses to keep their items fresh and dry for consumers during storage and shipping procedures.

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The correct formula of the compound can now be written as [tex]NiCl_{2} .9H_{2} O[/tex]

We know that when we talk about a hydrate, we are talking about a compound that has some molecules of the water of crystallization in it. Thus we have that in this case, the compound that we are considering is nickel chloride.

Given that;

Number of moles of anhydrous salt = Number of moles of hydrated salt

Number of moles of hydrated salt = 25/130 + 18x

Number of moles of anhydrous salt = 11.37 g/130 g/mol

= 0.087 moles

When we now apply the formula, we have;

25/130 + 18x = 0.087 moles

0.087 (130 + 18x) = 25

11.31 + 1.566x = 25

x = 25 - 11.31 /1.566

x = 9

We now get;

[tex]NiCl_{2} .9H_{2} O[/tex]

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Option C. Choice describes a couple of movement-reaction forces for the duration of the frenzy: The force of gravity on her body and the force of the wall on her feet.

Newton's laws of motion are 3 fundamental laws of classical mechanics that describe the connection between the motion of an object and the forces acting on it. those legal guidelines may be paraphrased as follows: A body stays at relaxation, or in movement at a steady speed in a straight line, unless acted upon through pressure.

Within the first regulation, an object will not alternate its motion unless pressure acts on it. inside the 2nd law, the force on an item is equal to its mass times its acceleration. inside the third law, when two objects interact, they practice forces on each other of identical value and opposite routes. Newton's 2nd regulation is one of the most important in all of physics. For a frame whose mass m is regular, it is able to be written inside the shape F = ma, in which F (pressure) and an (acceleration) are both vector quantities. If a body has a net force acting on it, its miles are multiplied in accordance with the equation.

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same number of protons but different numbers of neutrons.

Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons.
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.

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