Question

Of the following nonmetals, which is the LEAST reactive?

Answer 1

Answer: The least reactive non-metal is Selenium.

Explanation:

Chemical reactivity is defined as the tendency of an element to loose of gain electrons.

Non-metals are the elements which gains electrons and hence, their chemical reactivity will be the tendency to loose electrons.

Their chemical reactivity decreases as we move from top to bottom in a group. As, the electrons get added up in the new shell. So, the the electron in the outermost orbital gets far away from the nucleus. And hence, the electron will be difficult to gain.

Their chemical reactivity increases as we move from left to right in a period because the valence shell come closer to nucleus as we move from left to right. So, addition of new electron in the valence shell becomes easier due to greater attraction between nucleus and valence electron.

For the given options:

Option A: Sulfur

Sulfur (S) is located in period 3 and group 16 of the periodic table.

Option B: Chlorine

Chlorine (Cl) is located in period 3 and group 17 of the periodic table.

Option C: Bromine

Bromine (Br) is located in period 4 and group 17 of the periodic table.

Option D: Selenium

Selenium (Se) is located in period 4 and group 16 of the periodic table.

Hence, the least reactive non-metal is Selenium.

Answer 2

The answer is C.

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