Total number of electrons having n + l = 5 in Mo(42) atom in its ground state is:

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answer is D.

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Detailed Solution

Mo(Z = 42)....1s22s22p63s23p64s23d104p65s14d5Given (n + l = 5)Possible subshells n = 5, l = 0....5sn = 4, l = 1....4pn = 3, l = 2....3dTotal number of electrons = 1(5s) + 6(4p) + 10(3d)= 17

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