Question

Na , Mg and Al are the elements of the 3rd period of modern periodic table showing group number 1,2 and 13 respectively .which if these elements has the
(a)highest valency
(b)largaest atomic radius
(c)maximum chemical reactivity

Answer 1

a) amongst these Al has the highest valence as the valence electrons are more in number than the other two
b)Na has the largest atomic radius as it placed in before the other two elements in the group and as the atomic radius decreases along the group the elemnt in the period will always have the largest atomic radius than the other elements in the same period
c)again Na as it has only one electron in the outermost shell and the distance of the shell from the nucleus is more as compared to the other two anf tgus it can lose electrons easily and thus will have more chemical reactivity than the other two




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