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Question

In an atom, the total number of electrons with quantum numbers n=4,l=2 and s=+12 are :

A

10
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B

5
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C

7
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D

14
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Solution

The correct option is B
5
n=4,l=2 and s=+12
The above quantum numbers is the description of 4d subshell with spin s=+12.

Number of orbitals in a d subshell with l = 2 is 2l+1 = 2×2+1 = 5.

Total number of electrons possible since each orbital can have maximum of 2 electrons is 10.
The number of electrons with spin quantum number s=+12 are 5
The other 5 electrons will have the spin quantum number s=12

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