OMTEX CLASSES: What is the periodic trend in the variation of valency while going from left to right within a period. Explain the answer with reference to period 2 and period 3.

What is the periodic trend in the variation of valency while going from left to right within a period. Explain the answer with reference to period 2 and period 3.

What is the periodic trend in the variation of valency while going from left to right within a period. Explain the answer with reference to period 2 and period 3.