Hiw does the valency of elements vary
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On moving from left to right in the periodic table, valency increases up to 4 and then decreases. Valency of a particular element is determined by the electrons present in the last shell. If the number of valence electrons is less than or equal to 4, valency is equal to the number of valence electrons...
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In chemistry and atomic physics, an electron shell, or principal energy level, may be thought of as the orbit of one or more electrons around an atom's nucleus. The closest shell to the nucleus is called the "1 shel
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