The number of present in all the completely filled subshells having and is

Question

The number of  present in all the completely filled subshells having  and  is

Canvas Classes · Accepted Answer

Step 1: Subshells with n = 4

For :  → subshells: 4s, 4p, 4d, 4f

Step 2: Electrons with  in each completely filled subshell

In a completely filled subshell, each orbital has exactly 2 electrons (one with , one with ). So the number of electrons with  = number of orbitals in that subshell.

| Subshell |  | No. of orbitals |  with  |
|---|---|---|---|
| 4s | 0 | 1 | 1 |
| 4p | 1 | 3 | 3 |
| 4d | 2 | 5 | 5 |
| 4f | 3 | 7 | 7 |

Step 3: Total

Final Answer: 16

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