The atomic number of an element Y is 17. The number of electrons in its ion $Y^{-}$ will be
(a) 17 (b) 18 (c) 19 (d) 20

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Solution

Answer :

(b) 18
Anion $Y^{-}$ has one more electron than its neutral atom. Y atom has 17 electrons and therefore, in $Y^{-}$ , the number of electrons will be 18 (17 + 1).

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