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The atomic number of an element having the valency shell electronic configuration 4s24p6 is:
(1) 35
(2) 36
(3) 37
(4) 38
Ans: 35
An element has the electronic configuration 1s 2 , 2s 2, 2p 6 , 3s 2 , 3p 2 . Its valency electrons are: (1) 6 (2) 2 (3) 3 (4)4 Ans: 4
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