Group 2 elements are denser and harder than group 1 elements. Why ?

(True/False) Group 2 elements are denser than group 1 elements.

Group 13 elements show

Why zero group elements are inert ?

The least stable hydride of 15th group elements is

Give four points of resemblance of hydrogen with group 17 elements.

Ionisation energy of 5d-elements is more than 3d- and 4d-elements. Why ?

The electronic configuration of an element Z is 2, 8, 8. (f) Name the group of elements to which Z belongs.