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Question

Which of the following properties do not match with elements of the halogen family?


A
They have seven electrons in their valence shell
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B
They are highly reactive chemically
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C
They are metallic in nature
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D
They are diatomic in their molecular form
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Solution

The correct option is D They are metallic in nature
Halogens have $$ns^2p^5$$ configuration so they have $$7$$ valence shell electrons.

As they have $$7$$ valence electron so they have a high tendency to gain one electron and are non-metallic.

Due to incomplete octet, they are highly reactive and exists as diatomic in molecular form as $$X_2$$.

Hence, the correct option is $$\text{C}$$

Chemistry

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