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Why does lithium form covalent bond unlike other alkali which forms ionic bond?

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Why does lithium form covalent bond unlike other alkali which forms ionic bond?

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Lithium forms covalent bond which is different from its group members because of its anomalous behaviour Li is small in size, large charge / radius ratio and has high electro negativity value. Also it has only 1s2 2s1 orbital for bonding.

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