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Question

Which of the following element is most reactive?

A
Chlorine
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B
Fluorine
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C
Bromine
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D
Iodine
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Solution

The correct option is B Fluorine
Fluorine is the most reactive element in the halogen group. Fluorine is also the most electronegative (EN = 4.0) element in the periodic table. This indicates that fluorine has a high tendency to gain electrons from other elements with lower electronegativities.

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