Question

How many electrons are present in n = 3 orbit ?

Answer 1

Solution :

⏭ Given:

✏ Principle quantum number = 3

⏭ To Find:

✏ No. of electrons present in 3rd orbit.

⏭ Explanation:

✏ 3rd orbit contains three subshells.

1. s - subshell
2. p - subshell
3. d - subshell

✏ s - subshell contains one orbital.

✏ p - subshell contains three orbitals.

✏ d - subshell contains five orbitals.

✏ So, 3rd orbit contains total nine orbitals.

$\mapsto \boxed{ \bold{\sf{ \pink{ no.of \: electrons = 18}}}} \: \bigstar$

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Second way :

✏ No. of maximum electrons in any orbit is given by $\sf\blue{2n^2}$

$\implies \sf \: no.of \: electrons = 2 {(3)}^{2} = \boxed{ \sf{\gray{18}}}$