Question: Elements of group 1 and elements of group 17 both have valency 1 explain?
Elements in Group 1 and Group 17 of the periodic table both have valency 1 because they each have one electron in their outermost shell. Group 1 elements, also known as alkali metals, have one valence electron that they readily donate to other atoms to form positive ions. Group 17 elements, also known as halogens, have seven valence electrons and readily accept one electron from other atoms to form negative ions. Despite their opposite charges, both groups have a valency of 1 due to their need to gain or lose only one electron to achieve a stable electron configuration.
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