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The electron configuration for Helium (He) is shown below.

1s2

Which diagram shows the correct distribution of electrons in the electron shells of a helium atom?

Answers

Answer 1

Answer:

'*:*'

Explanation:

I know this looks weird, but

'= electron

*:* equals the nucleus, so 2 protons and 2 neutrons

and then '=electron


Related Questions

Convert this mass to SI Unit: 2000g

Answers

Answer: 2 kg

Explanation:

C₂H₂
a. resonance
b. no resonance

Answers

Answer:

no resonance

Explanation:

Since there is only one possible lewis structure C2H2 does not have resonance. A molecule has resonance if more than one lewis structure can be drawn for that molecule. For molecules with resonance, each lewis structure individually does not accurately depict the structure of the molecule

Is this a chemical reaction? Explain your reasoning. (Will give brainliest)

Answers

Answer:

No, it looks like there is no gas forming no foaming or burning so it is not

Explanation:

CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates. In the box below, draw a particulate diagram to show the species in the container after some of the CCl4(l) has evaporated. The phases of the species should be indicated by the spacing and distribution of the particles in the diagram. Some of the species shown in the legend will not be used.

Answers

Answer:

The phases of the species should be indicated by the spacing and distribution of the particles in the diagram

Explanation:

Evaporation would be a phase change from liquid to gas where intermolecular forces are broken CCl4 (l) -> CCl4 (g)

Diagram is attached below

We have that  from the diagram that when CCl4(l)  is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates that the molecules of CCl4(g)  becomes loosely held and apart from while in its closely held in its liquid state.

From the question we are told

CCl4(l) is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates. In the box below, draw a particulate diagram to show the species in the container after some of the CCl4(l) has evaporated. The phases of the species should be indicated by the spacing and distribution of the particles in the diagram. Some of the species shown in the legend will not be used.

Generally

We will see from the diagram that when CCl4(l)  is placed in a previously evacuated container at 30°C , and some of the CCl4(l) evaporates that the molecules of CCl4(g)  becomes loosely held and apart from while in its closely held in its liquid state

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In a chemical change, the same atoms are recombined into a new substances,
True
Or False

Answers

Atoms from DIFFERENT elements can combine to make a new substance so I would say that one is false sorry if Iam wrong :( i think it’s right because it produces a new substance with different or new atoms
I’m pretty sure the answer would be true

Explain the difference between potential energy and kinetic energy.



Sentence Starters

"Potential Energy is. . "

"Kinetic Energy is. . "

"The difference between potential energy and kinetic energy is. . ."

Answers

Answer:

Potential energy is the stored energy in an object or thing, while kinetic energy is the energy which an object contains because of a particular motion.

Explanation:

Potential energy is energy that is stored for example a wind up toy, it has energy but in order for you to get kinetic energy, it has to move. So kinetic energy is moving energy.

The difference is that potential is stored and kinetic is moving energy.

You are an employee at "cash for gold" and a customer comes in looking to exchange gold for money. They claim to have 3.47 gram nugget of fold. How many particles (atoms) of gold are in one nugget? With work shown

Answers

Answer:

The number of atoms in 3.47 gram nugget of gold is approximately 1.0606 × 10²² atoms

Explanation:

The given mass of gold = 3.47 grams

The molar mass of gold = 196.96657 g/mol

The number of moles of gold in 3.47 grams of gold = 3.47 grams/(196.96657 g/mol)

The number of moles of gold in 3.47 gram nugget of gold = 0.01762 moles

The number of atoms in one mole of gold = 6.02 × 10²³ atoms

The number of atoms in 0.01762 moles of gold = 6.02 × 10²³ atoms/mole × 0.01762 moles

The number of atoms in 0.01762 moles of gold ≈ 1.0606 × 10²² atoms

∴ The number of atoms in 3.47 gram nugget of gold ≈ 1.0606 × 10²² atoms.

Is the freezing point of this 5??
Please correct my mistake if it isn't.

Answers

Answer:

yes

Explanation:

Answer:

yes

Explanation:

you're smart have a nice evening

which 2 statements describe a mixture?
1. It includes atoms of different elements.
2. Its parts can be separated using physical means.
3. It can result from chemical bonding.
4. It is a pure substance.

Answers

Answer:

It's parts can be separated using physical means.It is a pure substance.

the amplitude of a wave is measured from
A. Trough to trough
B. Crest to resting position
C. Crest to crest
D. Crest to trough

Answers

Answer: Resting position

The number of electrons in the first three energy levels for four neutral elements is shown in the table. The element with the highest ionization energy is-

Answers

Answer:

The correct option is;

Element 2

Explanation:

The ionization energy is the energy required to eject an electron from a gaseous ion or atom

The ionization energy increases across the period and increases up the group

The elements with the highest ionization energy are those that have the complete octet structure in their outermost shell, which are the noble gases

Therefore, given that element 2, which has the complete octet structure in the outermost shell, then it is an element of the noble gases which have the highest ionization energy in a period, and therefore has the highest ionization energy.

On the periodic table, the element with 10 electrons is Neon, with ionization energy of 2080.68 kJ/mol which is the second highest after helium, that has only 2 electrons.

The number of protons in an element can be found by looking at the
symbol
atomic number
O average atomic mass
O name

Answers

Answer:

atomic number if it's a answer

Answer:

I think its the average atomic mass.

Explanation:

saturn is about 1 429 000 km from the sun. how many meters is saturn from the sun?

Answers

Answer:

1.493 trillion

Explanation:

Answer:

you must convert km to meters

Explanation:

The Periodic Table of elements is arranged by:
O atomic mass
O number of neutrons
O number of electrons
O atomic number

Answers

Answer:

atomic number

Explanation:

Answer:

number of electrons and number of neutrons

Pieces of inorganic or organic materials that come from rock and are
deposited by wind, water, or ice are called...


1.weathering
2. sediment
3.erosion
4.drought

Answers

Answer:

Sediment

Explanation:

Which best compares a molecule that has a trigonal planar shape with one that has a trigonal pyramidal shape?
O They both contain three lone pairs of electrons around the central atom.
O They both contain three atoms around the central atom.
O The central atom of the trigonal planar molecule has two lone pairs around it, but the central atom of the trigonal
pyramidal molecule has only one.
O The central atom of the trigonal planar molecule has two atoms around it, but the central atom of the trigonal
pyramidal molecule has only one.

Answers

Answer:

B. They both contain three atoms around the central atom.

Explanation:

Answer: b

Explanation:

What is a polar molecule?

A. A molecule with symmetrical polar covalent bonds

B. A molecule with symmetrical nonpolar covalent bonds

C. A molecule with a negative pole and a positive pole

D. A molecule with two atoms of the same electronegativity

Answers

Explanation:

A molecule with a negative pole and a positive pole is called a polar molecule.

(d) A molecule with two atoms of the same electronegativity

What is meant by a polar molecule?

 A polar molecule is usually formed when the one end of the molecule is said to possess more positive charges and whereas the opposite end of the molecule has negative charges, creating an electrical pole.

What is a polar molecule example? Water (H2O) is a polar molecule. The bonds between hydrogen and oxygen are distributed so that the hydrogen atoms are both on one side of the oxygen atom rather than evenly spaced.Sodium Chloride (NaCl) which is an ionic compound acts as a polar molecule. Usually, the large difference in electronegativities in sodium and chlorine makes their bond polar.

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What effects do mutations have? Check all that apply.

Answers

A mutation in DNA can be dangerous if it is a deletion!! Hope this helps you out!!! Can u please mark me brainliest? Thanks!!! :)

Answer:

A,C,E,F

Explanation:

Na + HCI → H2 + NaCl​

Answers

Answer: 2Na + 2HCl —> H2 + 2NaCl

Which roller coaster
car has the least potential energy due to gravity

Answers

Answer:

the roller coaster car with the least potential energy would be the one at the bottom of the roller coaster

Explanation:

Hope this helped

what do you think would be a good science fair project for an 8th grade advanced class?​

Answers

Answer:

maybe something about planets or the solar system and they have to make them

Explanation:

Answer:

create a rainbow of flames or build an infinty mirror

Explanation:

Use the picture to answer the question.
Name at least three physical properties of the bowling
ball.

Answers

Answer:

The physical properties is hardness shape and color, I choose hardness because I have grabbed bowling balls before and they are very hard well there could be different types of bowling balls made of different things but I have never seen one or toughed a bowling ball that is not hard. Another physical property  I chose for the bowling ball was shape, The reason I chose shape was because the bowling ball is circle, the actual name for a 3-D circle is sphere. The last physical property for a bowling ball is color because mostly all bowling balls have color for example the one in the picture it is red with a little bit of pink, there is many different bowling balls that have different color different hardness but NOT different  shape. That is the physical properties of a bowling ball.

Explanation:

Hope this helps everyone who needed help with this :)

Identify and give an example of at least two molecular properties that could be used to separate a substance from a mixture.

Answers

Answer:

Two molecular properties that could be used to separate a substance from a mixture are - Filtration and Chromatography .

Explanation

Molecular property -Molecular properties include the chemical properties, physical properties, and structural properties of molecules, including medicines. Typically, molecular properties do not include a chemical compound's pharmacological or biological properties.

Filtration -: Using a filter medium that allows the fluid to move through but not the solid, filtration is a method used to distinguish solids from liquids or gases. The term 'filtration' refers whether the filter is mechanical, chemical, or physical. The filtrate is considered the fluid that flows through the filter. A surface filter, which is a solid that traps solid particles, or a depth filter, which is a bed of material that traps the solid, may be the filter medium.

Usually, filtration is an imperfect operation. On the feed side of the filter or embedded in the filter media, some fluid remains and some tiny solid particles make their way through the filter.

example - Filters containing fibers that trap particulates are used by many aquariums.

Chromatography -: A laboratory method for the isolation of a mixture is chromatography. The mixture is dissolved in a fluid called the mobile phase (gas, solvent, water) that carries it through a device (a column, a capillary tube, a plate, or a sheet) on which a material called the stationary phase is fixed. For the stationary step, the different constituents of the mixture have different affinities.

Chromatography can be analytical or preparatory. Preparative chromatography is intended to isolate the components of a mixture for subsequent use and is therefore a method of purification. Analytical chromatography is usually conducted with smaller quantities of material and is intended to assess the presence of analytes in a mixture or to measure their relative proportions. Both are not limited to each other.

An example of chromatography is when a chemical reaction is used to separate each of the various sized molecules on a piece of paper in a liquid compound into their own pieces.

Hence , the answer is filtration and chromatography .

Please help!!!!!!!!! ASAP!!!

Answers

Answer:

0.00505

Explanation:

You can google the answer or try to learn how to convert it

A balloon is a sphere with a radius of 5.0 m. The force of air against the walls of the balloon is 45 N.

What is the air pressure inside the balloon?

Surface area = 12.56 × radius²

1 Pa = 1 N/m²

How would one solve this? What is an easy way to remember how to solve this problem or a list of steps to solve?

Answers

Answer:

1.4 x 10^-1 Pa

Explanation:

answer is above

A science teacher heated liquid ethanol for an experiment. When he turned up the temperature, the ethanol quickly disappeared, and a strong aroma filled the room. What happened to the ethanol?

Answers

Answer:

Heating the particles in the ethanol energized them, and they escaped to fill the room as a gas

Explanation:

Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .

What do you mean by ethanol  ?

Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.

Ethanol is an important industrial chemical; it is used as a solvent, in the synthesis of other organic chemicals.

Ethanol produced either by fermentation or by synthesis is obtained as a dilute aqueous solution and must be concentrated by fractional distillation.

Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .

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what is percipatation

Answers

Answer:

Water that falls from the clouds.

Explanation:

How many atoks are in each element sampke? 16.5 g Sr, 26.5 g Fe, 7.73 g Bi, 36.4 g P​

Answers

Answer:

16.5gm of Sr(strontium) has 1.12 x10^23 atoms...26.5 gm of Fe(iron) has 2.84 x10^23.... 7.73 gm of Bismuth has 2.22 x10^22.....36.4gm of  Phosphorus has 7.06 x10^23

Explanation:

by the formula,

                          Moles=[tex]\frac{no of atoms}{Avogadro's No}[/tex]

you could find moles by

                                      Moles = given mass/atomic mass

Put the value of moles and multiply it by Avogadro's no you will get the following answers

i sweari need ur help
3-Mention the trends in atomic size,atomic number,mass number,reactivity,boiling & melting points.

Answers

Answer:

1 sec......................

Answer:

happy halloween Baby i love you

Explanation:

1s^ 2 2s^ 2 2p^ 6 3s^ 2 3p^ 6 4s^ 2 3d^ 10 4p^ 2 what element is this

Answers

Answer:

please use shell notation

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