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Question

Three elements 'X', 'Y' and 'Z' have atomic numbers 18, 19 and 20 respectively. How many electrons are present in the M shells of these elements?

A
8, 9, 10
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B
8, 10, 13
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C
8, 8, 8
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D
8, 9, 12
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Solution

The correct option is C 8, 8, 8
Electronic configuration of X = 2, 8, 8 = 1s22s22p63s23p6
Electronic configuration of X = 2, 8, 8, 1 = 1s22s22p63s23p64s1
Electronic configuration of X = 2, 8, 8, 2 = 1s22s22p63s23p64s2
M shell is the third orbit of any element i.e. n = 3 and it contains maximum of 18 electrons
In element X, Y and Z, M-shell contains 8 electrons each.




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