how valency of element varies when we go from left to right in a period of periodic table
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Valency increases from 1 to 4 and then reduces to zero when we move from left to right across a period. Number of valence electrons increases from 1 to 8 when we move from left to right across a period.
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Answer:
1to4 ,1to8
Explanation:
move from left to right across a period
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