which elements are the anomalous behaviour of first members of each group.?
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The anomalous behavior of every first element in a group is due to the non availability of d-orbital in their valence shell, small size, high electronegativity... Just like carbon, it doesn't have d-orvital like the remaining members of group 4,so can't expand it's covalency to accept more than 4 pairs of electrons.
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