Multiple Choice Question Answer XVII — task. Science CBSE, Class 10.

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1. The chemistry of lithium is very similar to that of magnesium even though they are placed in different groups. Its reason is

The ratio of their charge and size is nearly the same
Both are found together in nature
Both have similar electronic configuration
Both have nearly the same size

2. Which one of the following groups of atoms or ions is not isoelectronic?

$K^+$ , $Ca^2{^+}$ , $Ne$
$Na^+$ , $Mg^2{^+}$ , $Al^3{^+}$
$F^-$ , $O^2{^-}$ , $N^3{^-}$
$He$ , $H^-$ , $Li^+$

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