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Give reason: Coodination number of Be is...

Give reason: Coodination number of Be is 4, but that of Mg is six

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Beryllium does not have d subsshell in `n=2` level. It has only 4 valence orbital. Hence it can have a coordination number 4.
Mg has d subshels in `n=3` level. Hence it has more valence orbtial. Therefore it can have a coordination number 6.
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