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How many electrons in an atom may have the following quantum numbers?

(a) n = 4; ms = – 1/2

(b) n = 3, l = 0.

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(a) For n = 4 1 

Total number of electrons = 2n2 = 2 x 16 = 32 

Half out of these will have ms = – 1/2

Total electrons with ms (- 1/2) = 16. 

(b) For n = 3 

l = 0; m1 = 0, ms = + 1/2 – 1/2 (two e-).

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