Q.

Astatine is a radioactive halogen. It is a solid at room temperature because

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a

of less van der Waal’s force of attraction between small atoms of astatine

b

of greater van der Waal’s force of attraction between large atoms of astatine

c

of less van der Waal’s force of attraction between large atoms of astatine

d

it shows non-metallic characters

answer is A.

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Detailed Solution

Because of its large size, the Van der Waal’s force of attraction is strong, which makes it solid

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Astatine is a radioactive halogen. It is a solid at room temperature because