Answers
Answer:
286
Explanation:
Add atomic mass of all the Isotopes,
Outcome = 825
divide it by number of isotopes which is 4 because there are 4 isotopes
Atomic mass of x = [tex]\frac{825}{4}[/tex]
Atomic mass of x is 286
The atomic mass of the unknown element X is 206 amu. Thus option B is correct.
What is atomic mass?Atomic mass is defined as the relative mass of the element's atom in comparison to the mass of an atom of the C12 isotope.
In an example, the general atomic mass is the average of the atomic masses of a large number of different isotopes.
First we added atomic mass of each isotopes
= 204 + 206 + 207 + 208 = 824
Now to calculate the atomic mass of element X we divide it by 4 as there is four isotopes
So, atomic mass = 824 / 4
= 206 amu
Thus, the atomic mass of the unknown element X is 206 amu. Thus option B is correct.
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Related Questions
9) Which must be a mixture of substances?
A) solid
B) liquid
C) gas
D) solution
Answers
Answer:
D
Explanation:
Which of the following contribute(s) to most of the mass of an atom?
Question 6 options:
A)
Neutrons only
B)
Protons and neutrons
C)
Protons and electrons
D)
Protons only
Question 7 (5 points)
In a certain chemical reaction, the bonds of the products contain more energy than the bonds of the reactants. For the reaction to occur, which of the following best describes what occurred?
Question 7 options:
A)
Energy was released, so the reaction is endothermic.
B)
Energy was released, so the reaction is exothermic.
C)
Energy was added, so the reaction is endothermic.
D)
Energy was added, so the reaction is exothermic
Question 8 (5 points)
A solution
Question 8 options:
A)
is a single-phase homogeneous mixture.
B)
must contain water.
C)
is always a liquid.
D)
can contain more than two phases.
Question 9 (5 points)
Which of the following is true of alloys?
Question 9 options:
A)
They can only be composed of metals.
B)
They must be held together by chemical bonds.
C)
They're liquid solutions.
D)
They must contain a metal.
Question 10 (5 points)
Which of the following best describes an atomic number? An element's identity is defined by its atomic number; this means it represents the number of
Question 10 options:
A)
electrons in the element.
B)
neutrons in its nucleus.
C)
protons plus neutrons in its nucleus.
D)
protons in its nucleus.
Answers
Answer:
1.
B) protons and newtrons
2.
D)
3.
C)
4.
A)
Question 1 of 10 What is molarity a measurement of? O A. The volume of liquid containing a dissolved substance B. The grams of a substance dissolved in a liquid O c. The concentration of a substance dissolved in a liquid O D. The number of moles of a dissolved substance
Answers
To do this measure called molarity is commonly used. Molarity (M) is defined as the number of moles of solute (n) divided by the volume (V) of the solution in liters. It is important to note that the molarity is defined as moles of solute per liter of solution, not moles of solute per liter of solvent.
so the answer is D.
hope this helps have a great day....!
According to the concept of molar concentration, molarity is defined as the number of moles of a dissolved substance.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.
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if two successive terms of the fibonacci sequence are both odd, is the next term is even or odd? why?
Answers
Answer:
Even because you always add the previous two terms in the sequence. Since they are both odd, the next term will be even. (odd+odd = even)
Explanation:
Why can stars be called element factories?
Answers
Answer:
They came from the element factories we call stars. Stars are mostly hydrogen throughout most of their lifespans. They are driven by massive and continuous thermonuclear reactions and gravity. ... This extra heat begins to fuse helium atoms into heavier elements like carbon and oxygen and gives new life to the star.
Explanation:
Is it true or false that the Temperature is a direct measurement of the energy stored in a substance?
Answers
A solution that holds more solute than it normally can under the conditions at a given temperature is _____. supersaturated unsaturated saturated diluted
Answers
Answer:
Supersaturated !
Explanation:
Sanjay is learning about the elements that make up Earth’s crust. Ms. Richards, his Earth science teacher, gives him an element and asks him to determine which element from Earth’s crust it is. She also provides Sanjay with this table. Sanjay weighs the element and finds that it has a mass of 17.98 g. By placing the element in water, he determines the volume of the substance to be 2.2835 mL.
Based on the table from Ms. Richards, what element from Earth’s crust did Ms. Richards gave to Sanjay?
A) iron
B) calcium
C) aluminum
D) silicon
Answers
Answer:
Iron
Hope this helps! Stay safe!
(Plz vote me as brainliest)
Answer:iron
Explanation:
How would I create a Lewis dot structure with the compound: CHBr2Cl
Answers
Answer:
Step 1: Find the Total Number of Valence Electrons. ...
Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy" ...
Step 3: Determine the Number of Bonds in the Molecule. ...
Step 4: Choose a Central Atom. ...
Step 5: Draw a Skeletal Structure. ...
Step 6: Place Electrons Around Outside Ato
Explanation:
What would happen if I throw nail polish remover into the fireplace
Answers
Answer:
Your house could catch fire because while Nail Polish Remover itself isn't particularly flammable, the vapors it gives off are. Because of this, sparks could occur if nail polish is used near open flame or was tossed in, and then the sparks could catch onto something else and grow. I would not recommend trying this.
Explanation:
Which of the following is the BEST description of our atmosphere?
It dissolves meteors and protects us from ultraviolet radiation.
It’s made of a mixture of gases that protect Earth and help create conditions that allow life to live here.
It’s made of nitrogen and oxygen.
It contains a mixture of gases.
Answers
Answer:
I think the answer is B.
Answer:
B
Explanation:
Other things like A, C, and D are not the best explanation because they are all simple senteces.
What does the name "atom" mean in
Greek?
Answers
It means indivisible
Answer:
The Greek root of atom is atomos, which means "indivisible," since the scientists who first gave the atom its name imagined it couldn't be split or divided into smaller pieces.
Explanation:
in addition to Earthquake, hurricane, which of the following could be categorized as a "disaster" risk?
Answers
Answer:
I think its a World War.
Explanation:
This is just what my sister told me, since the cost for the war could make a country poor and the damage it could cause could lead a country to disaster.
i think d answer is tsunami
What’s it called when a sound wave is slowed down by a new medium?
Answers
Answer:
Refraction of waves involves a change in the direction of waves as they pass from one medium to another. ... Sound waves travel slower in cooler air than they do in warmer air.
Explanation:
18. Which two particle diagrams each represent a sample of one substance? Key O = atom of oxygen = atom of hydrogen 0 = atom of chlorine 8 OO 1 நம் மும் 20 2000 (1) I and III (3) II and IV (2) II and III (4) I and II
Answers
Answer:
1 and 11
Explanation:
Answer:1 and 11
Explanation:
What would be the temperature as well as pressure inside and outside of a can if it were to be placed in cold water?
Answers
Answer:
The hot gas molecules are the same pressure as the air outside the can. When the can is placed in cold water upside down, the hot gas water molecules are cooled very rapidly. ... Since the air pressure outside the can is stronger than that inside the can, it causes the can to collapse.
Explanation:
At what time was the frog sitting still or at rest
Answers
Answer:
What are the times and is that your question?
Explanation:
Radio waves are examples of electromagnetic waves. T or F
Answers
Answer:
the answer is true
Explanation:
what is the name of CH3CH2CH2C(O)CH2CH3
Answers
Answer:
1-methoxypropane
Explanation:
What are the four main types of tissues in the human body?
epithelial
dermal
vascular
connective
muscle
nervous
Answers
Answer:
epithelium, muscle, connective tissue and nervous tissue.
Explanation:
Explanation:
Epithelial
Connective
Muscle
Nervous
When an atom is trying to obtain stability, what part(s) of the atom change(s)?
Answers
How is the term stable used in the text?
Answers
Answer:
When something is stable, it's fixed and steady. If you needed advice, you'd probably go to your most stable friend, the one least likely to act crazy or be easily upset.
Explanation:
Whether you're talking about an object or a person, the adjective stable implies reliability and strength. You can describe a government as stable, or a relationship, or a desk. A completely different meaning of stable is the noun "building used for housing horses or other animals." Both senses of the word come from the Latin stabilis, "firm or steadfast."
The process during which a substance changes from a solid directly to a gas without becoming a liquid is known as: Example(dry ice)
A)
condensation.
B)
fusion.
C)
melting.
D)
sublimation.
Answers
What formations are created by sand deposition by waves?
Cirques
Dunes
Horns
Spits
Answers
Answer:
Spits
Explanation:
Deposit by waves include beaches. They may shift along the shoreline due to longshore drift. Other wave deposits are spits, sandbars and barrier islands
Answer: D
Explanation:
Which of the following situations best describes an ionic bond?
Two atoms each give up an electron, and an electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force attracts them.
One atom gains an electron while the other atom loses an electron, and an
electrostatic force repels them.
Two atoms gain electrons and an electrostatic force attracts them.
Answers
The situation which best describes the ionic bond is “ One atom gains an electron while the other atom loses an electron, and an electrostatic force attracts them”.
What is an ionic bond?
An ionic bond is formed between two atoms by donating an electron from the electropositive atom and withdrawal of that electron by the second atom which is electronegative and thereby attaining stability by making their valency completed.
The electron loss-gain interaction make an electrostatic force of attraction between them, where the electrons from the electropositive atom is attracted towards the electronegative atom.
Thus the two atoms are bound together by the electrostatic force of attraction created by the electron donation. Hence, option b is correct.
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Which element has an outer(ending) electron configuration of s2p4?
Answers
The question is in complete, the complete question is:
Which element has an outer electron configuration of s 2 p4 ?
(A) Ca (B) Cr (C) Ge (D) Se
Answer:
(D) Se
Explanation:
The outer electronic configuration of an atom reflects the group to which it belongs in the periodic table. Each group has its unique outermost electron configuration and number of electrons found in the outermost shell of the atoms of elements in the group.
s 2 p4 is the unique outermost electron configuration of group 16 elements. Group 16 elements have six electrons in their outermost shell. If we consider the options, only Se is a member of group 16. Hence it is only Se that has the outermost electron configuration s 2 p4 .
An element which has an outer (ending) electron configuration of [tex]s^2p^4[/tex] is: Oxygen.
Electron configuration can be defined as a formula that is used to denote the distribution of the atoms of a chemical element in an atomic orbital.
Basically, electron configuration uses four (4) main letters to illustrate the distribution of atoms in an atomic orbital:
spdfThe electron configuration of [tex]s^2p^4[/tex] indicates that the chemical element is in Group 6 and has six (6) electrons in its outermost shell.
Hence, a chemical element such as Oxygen (O) or Selenium (Sn) in Group 6 of the periodic table would have an electron configuration of [tex]s^2p^4[/tex].
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Rank lead, phosphorus, and barium in order of increasing ionization energy.
A) Pb < P < Ba
B) Ba < P < Pb
C) Pb < Ba < P
D) Ba < Pb < P
Answers
Answer:
D) Ba < Pb < P
Explanation:
Barium (Ba): 5,2117
Lead (Pb): 7,4167
Phosphorus (P): 10,4867
Increasing order of ionization energy:
Ba < Pb < P
Electronic configurations of given elementsPb: [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p²
P: [Ne] 3s² 3p³
Ba: [Xe] 6s²
All the given elements have stable half-filled subshells. But phosphorus has the smallest atomic size among them, so it will have the lowest tendency to remove an electron from its valence shell and hence will require the highest amount of ionization energy. Barium has a higher atomic size than lead, therefore it has lower ionization energy than lead.How are ionization energy and atomic size related?The force of attraction is stronger when the electron is closer to the nucleus, and as a result, more energy is needed to overcome this attraction and remove the electron.Therefore, the ionization energy increases with decreasing radius and vice versa.Learn more about trends of ionization energy here:
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In models of molecules, spheres of different colors and
sizes represent different types of atoms.
Which model shows a molecule of a substance that is made up of three
elements?
A
B
C
Or
D ?
Answers
Answer:
D
Explanation:
According to this question, each model of molecules in the options contains spheres of different colors and sizes representing different types of atoms. The atoms of the same element are the spheres of same color and size while atoms of different element are of different color or size.
Therefore, the model showing a molecule of a substance that is made up of three elements is model D because it is made up of three distinct spheres representing atoms of each element.
- The red sphere is the atom of the first element
- The big dark sphere is the atom of the second element
- The small white sphere is the atom of the third element
Answer:
D
Explanation:
The purpose for witch something is designed or exists
Answers
Answer:
to help
Explanation:
to help
what is the hybridization of NO2
Answers
Answer: Explanation:
If we apply the hybridization rule then it states that if the sum of the number of sigma bonds, lone pair of electrons and odd electrons is equal to three then the hybridization is sp2.