Which of the following elements with atomic numbers 25, 30, 48 and 80 has the highest vapour pressure at room temperature?

Z = 30

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Z = 48

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Z = 80

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Z = 25

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Solution

The correct option is C
Z = 80

Element with atomic number 80 is Hg, which has weak metallic bonding and exists as a liquid at room temperature, hence has the highest vapour pressure.

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