valency of 1st group
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The valency of an element is determined by the number of outer shell (valence) electrons. ... All elements in group 1 have 1 valenceelectron so they have a valency of +1 as they will tend to give up 1 electron. This is the same for group 2 which will give up two electrons and group 3 which will give up 3 electron .
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1st group have 1 valency
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