Question

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

Answer 1

A). 13 Group
B) 1 group
c)1 group..

Sodium because it easily lose their electron ...where Mg ,Al, not easily lose there electron ...
* In Sodium the There is one electron in there last Shell.... where other have more than electron than Na ...so there do to large positive charge their radius will get short.....