What is the electron configuration of an element with atomic number 20?

Answers

Answer 1

Answer:

Answer: $1s^22s^22p^63s^23p^64s^2$

Explanation: The element with atomic number 20 consists 20 electrons and as atomic number is specific to an element, atomic number is of element calcium.

The nearest noble gas to calcium is argon with 18 electrons with configuartion $1s^22s^22p^63s^23p^6$ according to afbau's rule, in which orbitals are arranged in order of increasing energies.

Thus electronic configuartion of calcium in terms of noble gas configuration is:

$Ca:20:[Ar]4s^2$

Answer 2

Answer: 1s2,2s2.2p6,3s2,3p6,3d4,4s2

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Describe and explain how petrol is separated from the mixture of hydrocarbons in crude oil?

Answers

It's an exciting and interesting process but those 5 points aren't worth a decent answer. The whole process is called fractioned distillation where different temperatures are reached, transforming the crude oil in gas. After being hit by a cold source it colds becoming different hydrocarbons depending on the temperatures.

The chemical reaction in which compounds break up into simpler Constituents is a.

Answers

decomposition its the answer

Answer:

decomposition

Explanation:

did the test and got it correct

the word circuit means ________ therefore a circuit is a ___________ around which electricity or water flows

Answers

Answer:

the word circuit means go around therefore a circuit is a closed path around which electricity or water flows

Explanation:

Help this was helpful

What element has 81 protons in the nuclei of its atoms? A. Platinum
B. Uranium
C. Lead
D. Thallium

Answers

Thallium has got 81 protons

Have a nice days.......

Thallium has 81 protons in the nuclei of its atoms.

When floral design first emerged as an art form, which technique was emphasized?

Answers

using flowers in their natural state and shape

In the world of chemistry a mole is a number of something a very large number of something.Just as a dozen is 12 of something a mole is about 6.02*10^23 of something.
In chemistry we like the number of atoms or molecules in moles.
If one mole is equal to 6.02*10^23 atoms and you have 9.00 *10^23 atoms then how many moles do you have?

Answers

Answer;

= 1.495 moles

Explanation;

-One mole contains 6.02 ×10^23 particles

Therefore;

1 mole = 6.02 ×10^23 atoms

Thus; 9.00 ×10^23 atoms will have;

= 9.00 ×10^23 atoms / 6.02 ×10^23 atoms

= 1.495 moles

Answer:

2.49

⋅

−

moles Pb

Explanation:

Before doing any calculations, it's worth noting that atoms do not contain moles, it's the other way around.

A mole is simply a collection of atoms. More specifically, you need to have exactly

6.022

⋅

atoms of an element in order to have one mole of that element - this is known as Avogadro's number.

In your case, you must determine how many moles of lead would contain

1.50

⋅

atoms of lead.

Well, if you know that one mole of lead must contain

6.022

⋅

atoms of lead, it follows that you get

1.50

⋅

atoms of lead in

1.50

⋅

atoms of Pb

⋅

1 mole Pb

6.022

⋅

atoms of Pb

2.49

⋅

−

moles Pb

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