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Question

An element 'X' has 18 electrons in 'M' shell and 1 electron in 'N' shell which is the valence shell. Identify the group and period to which 'x' belongs. Also predict the other elements of the same group.

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Solution

Element X : M shell= 18 electrons
M shell means n= principal quantum number =4 and N shell = 1 electron.
N shell means n = principal quantum number =4
Therefore, element X=Cu with electronic configuration as :-
Cu : 1s22s22p63s23p63d104s1
Other elements of group 11 are Cu (Copper), SIlver (Ag) and Gold (Au).

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