Question

the valencey of elements in a paricular group is ?
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Answer 1

The valency of an element is determined by the number of outer shell (valence) electrons. ... This is the same for group 2 which will give up two electrons and group 3 which will give up 3 electron . Group 5 elements, however, have 5 valence electrons and will tend to take 3 electrons and so have a valency of -3.