an element have atomic weight 40 and its
An element have atomic weight 40 and it's electronic configuration is 1s2, 2s2, 2p6, 3s2, 3p6. Then its atomic number and number of neutrons will be:
(1) 18 and 22
(2) 22 and 18
(3) 26 and 20
(4) 40 and 18
Ans: (a)18 and 22
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