Non-metallic character __________ across a period from left to right.

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decreases

remains the same

first increases then decrease

increases

answer is A.

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Detailed Solution

On moving across a period in the periodic table the atomic size decreases and the nuclear charge increases.
Due to this, the pull of the nucleus on electrons increases.
So the tendency of an atom to lose electrons decreases.
The metallic character is the tendency of an element to lose electrons and forms positive ions or cations, so the metallic character decreases.
Since the metallic character decreases, the non-metallic character of the element increases.

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