Question

Why does the third shell of any element consists of 8 electrons although the capacity of the third shell is 18 ? For example, potassium has electronic configuration of 2, 8, 8, 1. Should'nt it be 2, 8, 9 as third shell can occupy 18?

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Answer 1

Answer:

4s2 not the third shell, but the next 10 electrons go into the 3d orbitals that are part of the third shell but shown on the fourth shell level. ... So the third shell can be considered to hold 8 or 18 electrons but in total the third shell can hold 18 electrons.

Step-by-step explanation:

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Answer 2

Answer:

Explanation:

The first stable element in the VIII A group ( noble or inert gases) is Helium

1s^2

2 electrons in the first shell 2 electrons total

The second stable element in the VIII A group is

Neon

1s^2

2s^2

2p^6

8 electrons in the 2nd shell 10 e

total

The third stable element in the VIII A group is Krypton

1s^2

2s^2

2p^6

3s^2

3p^6

8 electrons in the 3rd shell 18

e

−

In this sense the third shell can hold 8 electrons.

However in the fourth shell the 19th and 20th electrons go into the

4

s

2

not the third shell, but the next 10 electrons go into the 3d orbitals that are part of the third shell but shown on the fourth shell level.

In this sense the third shell can hold a total of 18 electrons.

So the third shell can be considered to hold 8 or 18 electrons but in total the third shell can hold 18 electrons.

Step-by-step explanation:

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