How is valency determined?
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Valency of an element is determined by the number of valence electrons present in the outermost shell of its atom.
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Valency is defined as the combining capacity of an atom or a molecule. ... If the number of electrons in the outer shell is between one to four, the compound is said to have positive valency. For compounds with electrons four, five, six, or seven, the valency is determined by subtracting the electron from eight.
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