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How does valency of an element vary across a period?



Valency is equal to the number of valence electrons. In the modern periodic table, valency first increases till the number of valence electrons is 4. After that, it decreases as we keep moving right.

Therefore,  as we move from left to right in a period, valency first increases then decreases .


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CA Maninder Singh is a Chartered Accountant for the past 12 years and a teacher from the past 16 years. He teaches Science, Accounts and English at Teachoo