How does valency of an element vary across a period?

 

Answer

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 .

PERIODIC TREND OF VALENCY - Teachoo.png

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CA Maninder Singh is a Chartered Accountant for the past 14 years and a teacher from the past 18 years. He teaches Science, Economics, Accounting and English at Teachoo