Explain why chromium,molybitnam and tungustan are hard metal where as zinc, cadmium and Mercury are not hard ?
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The metal's chromium (Cr), tungsten (W) and molybdenum (Mo) have the maximum number of unpaired d-electrons. Therefore, these transition metals are very hard. On the other hand, we have zinc (Zn), cadmium (Cd) and mercury (Hg) which are not very hard as they do not possess unpaired d-electrons.
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