How will the tendency to gain electrons change as we go to left to right across a period ? Why?
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Tendency to gain electrons increases as we go from left to right in a period because the effective nuclear charge increases and the atomic radius decreases.
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As we move from left to right across a period in the periodic table, the tendency to gain electron increases. As a result, the effective nuclear charge acting on the valence electrons increases. Hence, the tendency to gain electrons increases.
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