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A-II, B-I, C-IV, D-III
The density of the alkaline earth metals first decreases down the group and then increases.
The variation in the densities is a result of the cumulative effect of the atomic size and various inter molecular forces acting in the metal atoms.
The correct order of the density is:-
$\mathrm{Ca}(1.55) < \operatorname{Mg}(1.74) < \mathrm{Be}(1.84) < \mathrm{Sr}(2.63)$
The variation in the densities is a result of the cumulative effect of the atomic size and various inter molecular forces acting in the metal atoms.
The correct order of the density is:-
$\mathrm{Ca}(1.55) < \operatorname{Mg}(1.74) < \mathrm{Be}(1.84) < \mathrm{Sr}(2.63)$
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