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Transition metals show high melting ...

Transition metals show high melting points why ?

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(I ) The melting points of the transition metals are high due to the 3d electrons being available for metallic bonding
(ii) As we move from left to right along the transition metal series melting point first increses as the number of unpaired d electrons available for metalllic bonding increases , reach a maximum value and then decreases as the d electrons pair up and become less available for bonding .
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