Question

How will the tendency to gain electron change as we go from left to right across a period?why?

Answer 1

Answer:

The tendency of gaining electrons increase as we move left to right across a period because as we move left to right the electronegative character increases and hence the elements on the right are more likely to gain electrons rather than losing them.

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Answer 2

Answer:

On moving from left to right across a period, metallic  character decreases and non-metallic character  increases.

Since metals tend to lose electrons and non-metals  tend to gain electrons, the tendency to gain electrons  increases as we move from left to right across a period.