Question

Mercury is the only metal which is liquid at zero degree celsius this is due to

Answer 1

hyy dear....

here ur answer is....

Mercury is the only metal that is a liquid at normal temperatures and pressure. 
The electrons in a mercury atom are bound more tightly than usual to the nucleus.

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Answer 2

$\huge\bold{☁︎Answer☁︎}$

Mercury is the only metal which is liquid at 0∘C. It is due to very high ionisation energy which results in weak metallic bonding.