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Quantum Number

How many elec...

Question

How many electrons in an atom with z = 104 can have $(n + l) = 8$ ?

A

18

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B

16

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C

3

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D

6

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Solution

The correct option is C 16
$R u =$ $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{6} 3 d^{10} 4 s^{2} 4 p^{6} 4 d^{10} 5 s^{2} 5 p^{6} 4 f^{14} 5 d^{10} 6 s^{2} 6 p^{6} 5 f^{14} 6 d^{2} 7 s^{2}$
For $6 d$ and $5 f$ orbital only $(n + l) = 8$ , which contains 16 electrons.

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