Question

Na , Mg nd Al are the elements of the same period of modern periodic table nd 3 balance electrons respectively which of these elements?has the largest atomic radius ?is least reactive ?justify your answer stating reason in each case

Answer 1

Na has the largest atomic radius as it as lesser nuclear effects charge and Al is least reactive as its tendency to lose electron is less due to greater nuclear effective charge

Answer 2

Na is the largest atomic size 
Al is least reactive