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Question

In an atom, the total number of electrons with quantum numbers n=5,l=2,and s=12

A

5
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B

10
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C

3
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D

4
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Solution

The correct option is A
5
n=5,l=2,and s=12

The above quantum numbers is the description of 5d 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 = 10
number of electrons with spin s=12 is 5
The other 5 electrons will have the spin s=+12

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