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20 February, 05:02

Which of the following elements is less reactive than the others?

Bromine (Br)

Oxygen (O)

Selenium (Se)

Sulfur (S)

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  1. 20 February, 08:24
    0
    Bromine.

    Oxygen, selenium, and sulfur are all in group 16 and have 6 valence electrons. Bromine is in group 17 and has 7 valence electrons. The closer to 8 (a full, stable octet) you get, the less likely the element is to react.
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