Answer:
In chromium, the inter atomic
bonding in the atoms is very strong because they have five unpaired electrons \[(3{{d}^{5}}4{{s}^{1}})\]
in the d-subshell. Therefore, chromium is a very hard metal. On the contrary,
in mercury, the atoms have fully filled d-orbitals \[(5{{d}^{10}}6{{s}^{2}})\]
and the bonding in them is quite weak. Therefore, mercury is a liquid at room
temperature.
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