Question
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
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 Y2+ is 18 (20 → 2).
Is there an error in this question or solution?
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.
