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Chromium is a typical hard metal while m...

Chromium is a typical hard metal while mercury is a liquid.

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Cr has five unpaired d electrons in the d-subshell `( 3d^(5) 4s^(1))` . Hence, metallic bonds are very strong. In Hg, all the d-orbitals are fully filled `( 3d^(10) 4s^(2))`. Hence, the metallic bonding is very weak.
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PRADEEP-D- AND F-BLOCK ELEMENTS-CONCEPTUAL QUESTIONS
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  3. Chromium is a typical hard metal while mercury is a liquid.

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  10. Why do transition elements show variable oxidation state?

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