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Solution


Q.

The number of electrons present in all the completely filled subshells having n = 4 and s=+12 is ______.
(Where n = principal quantum number and
             s = spin quantum number)                              [2024]

Ans.

(16)

Maximum number of electrons in a shell with principal quantum number n=2n2

For n = 4, maximum number of electrons = 2×42=32

Out of these 32, half of the electrons (i.e. 16) have spin quantum number -12 and the remaining half have spin quantum number +12