#### Question

If the number of protons in one atom of an element Y is 20, then the number of electrons in its ion Y^{2}^{+}will be:

(a) 20

(b) 19

(c) 18

(d) 16

#### Solution

(c) 18

Number of protons is equal to the number of electrons in an atom. It is given that an atom of an element Y contains 20 electrons. Therefore, number of electrons in its ion Y^{2}^{+} is 18 (20 → 2).

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Solution 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 Concept: Formation and Properties of Ionic Compounds.