How Does valency of an Element vary across a period ??
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: The valency of an element depends the availability of an electrons (or electrons) in its valence shell i.e on its valence electrons. Across the period, first it increases from 0 to 4 and then starts decreasing from 4 to 1.
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Answer:
Across a period valency first increases and than decreases .
in a group all elements have same valency as they have same number of electrons in the outermost shell
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