How does the valency of elements change on moving from left to right in the third period of the periodic table?

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How does the valency of elements change on moving from left to right in the third period of the periodic table?

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  1. The valency of the elements increases from 1(Na) to 4 (Si) and then decreases to 0 (Ar), on moving from left to right in the third period of the periodic table.