The number of electrons present in all the completely filled subshells having and is (where = principal quantum number and = spin quantum number).

Question

The number of electrons present in all the completely filled subshells having  and  is  (where  = principal quantum number and  = spin quantum number).

Canvas Classes · Accepted Answer

Completely filled subshells with : 4s², 4p⁶, 4d¹⁰, 4f¹⁴

For each completely filled subshell, half the electrons have :

| Subshell | Total electrons | With  |
|----------|----------------|---------------------------|
| 4s² | 2 | 1 |
| 4p⁶ | 6 | 3 |
| 4d¹⁰ | 10 | 5 |
| 4f¹⁴ | 14 | 7 |

Total = 1 + 3 + 5 + 7 = 16

Answer: 16

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