Question

Na ,Mg and Al are the three elements of 3rd period of modern periodic table having group no. 1 ,2 and 13 respectively.which one of these elements has the-(a)highest valency (b) largest atomic radius (c) maximum chemical reaction .justify your ans. stating the reason for each

Answer 1

(a)Highest valency - Al {since valency of Al is 3+ which is more than valencies of Na and Mg which are 1+ and 2+ respectively}
(b)Largest atomic radius - Na{since atomic size decreases across a period}
(c)Maximum chemical reaction - Na {since reactivity decreases across a period}

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Answer 2

Answer:

1. here is the frienhds
2. above image