Question

Na, mg and al are the element of the 3rd period of the modern periodic table having group no.1,2and 13 respectively which one of these element has the
(a) highest atomic radius
(b) largest atomic radius
(c) maximum chemical reactivity justify your answer starting the reason of one each.

Answer 1

( a ) . Highest atomic radius = Na ( due to weak internal forces )
( b ) . Largest atomic radius = The same as ( a )
( c ) . Maximum reactivity = Na ( being left most of periodic table ).