Question

10. Na, Mg and Al are the elements of the 3rd period of the Modern Periodic Table having group number 1, 2 and 13
respectively. Which one of these elements has the (a) highest valency, (b) largest atomic radius, and (c) maximum
chemical reactivity ? Justify your answer stating the reason for each.
​

Answer 1

(a) 4

(b) francium

(C) In the periodic table, the maximum chemical reactivity is at the extreme left (alkali metals) and extreme right (halogens).