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Question
How does the number of valency vary on moving from left to right in the third period of the periodic table?
Solution
The valency of the elements increases from 1 (Na) to 4 (Si) and then declines to O (Ar) as moving from left to right in the third period of the periodic table.
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According to atomic structure, what determines which element will be the first and which will be the last in a period?
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