Write on the allotropy of group VA elements. 

Comment on the colour of group 17 elements.

Comment on the reactivity of group 17 elements.

Give a brief account of the allotropy exhibited by group 16 elements.

Group 13 elements show

Write the order of thermal stability of the hydrides of group 16 elements.

Give reason Atomic size of group 18 [0 group] elements is more than the atomic size of group 17 [VIIA] elements

Group 16 elements called

Write the names of all the VIIA group elements.

The atomic radii of group 13 elements are larger than those of group 2 elements. True/False.

Allotropy is due to