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The mass number of an anion, X3- is 14. If there are ten electrons in the anion, the number of neutrons in the nucleus of atom, X2 of the element will be:
(1) 10
(2) 14
(3) 7
(4) 5
Ans: 7
Correct set of four quantum numbers for valence electron of rubidium (Z = 37) is: (1) 5,0,0,+1/2 (2) 5, 1,0,+1/2 (3) 5,1,1,+1/2
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