Science, asked by mhussain765412, 5 hours ago

explain why elements in group 1 and 7 of the periodic table have the same valency.

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Answered by bashariyanizar

Answer:

Answer: (1) The valency of an element is determined by the number of valence electron in the outermost shell of an atom of an element. (2) All the elements in a group have the same number of valence electrons. ... Elements in the same group of the periodic table have the same valency

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