Question

GIVE REASON
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The outermost shell of atom like H and He can not accommodate more than two electrons. ​

Answer 1

The outermost shell of atom like Hydrogen (H) and Helium (He) can not accomodate more than two electrons because the maximum number of electrons in 1st energy level is 2 and they lie in K shell. An electron needs 8 electrons in its outermost shell to attain stable electronic configuration.

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More details :

i) For 1st energy level (K shell),n = 1

So,the maximum number of electrons in 1st energy level

→ 2n²

→ 2(1)²

→ 2

ii) For 2nd energy level (L shell),n = 2

So,the maximum number of electrons in 2nd energy level

→ 2n²

→ 2(2)²

→ 2(4)

→ 8

iii) For 3rd energy level (M shell) ,n = 3

So,the maximum number of electrons in 3rd energy level

→ 2n²

→ 2(3)²

→ 2(9)

→ 18

iv) For 4th energy level (N shell),n = 4

So,the maximum number of electrons in 4th energy level

→ 2n²

→ 2(4)²

→ 2(16)

→ 32

So,the maximum capacity of

• K shell is 2 electrons
• N shell is 8 electrons
• M shell is 18 electrons
• N shell is 32 electrons.