The electronic configuration of an element is 1s^22s^22p^63s^23p^63d^104s^1. What is the atomic number of last element of the same group which is recently discovered :- (1) 20 (2) 119 (3) 111 (4) None
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the atomic number of last elements of the same group is 30
a
so the answer for this question is none
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