Which is the most active element among folllowing?

Chlorine

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Oxygen

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Sulfur

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Fluorine

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Solution

The correct option is D Fluorine
Most active element is Fluorine. The reduction potential of fluorine is very high. Hence, it is extremely reactive in nature. Also F-F bond energy is low (38 kcal/mol). The valence shell electron configuration of fluorine $2 s^{2} 2 p^{5}$ indicates that it has very strong tendency to take up one electron to attain stable noble gas configuration. Hence, it has high reactivity.

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