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Which of the following element's outermo...

Which of the following element's outermost orbit's last electron has magnetic quantum number `m = 0`?

A

`Na`

B

`O`

C

`C1`

D

`N`

Text Solution

Verified by Experts

The correct Answer is:
A
`m= 0` corresponds to the `s` electron. This implies that the last electrin of the element should be an `s` electron. This is possible only for `Na`:
`1s^(2)2s^(2)2p^(6)3s^(1)`
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