1.

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y2+ will be : (a) 20 (b) 19 (c) 18 (d) 16

Answer»

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y2+ will be :

(a) 20

(b) 19

(c) 18

(d) 16



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