Halogen : The 17th Group

The element of the 17th group of the periodic table is likely to be

Halogens belong to group _____

What is the formula of binary compound formed between : 2nd element of II group and 1st element of 17th group ?

The general name of the element of 17^(th) group are

Three elements X, Y and Z belong to 17th group but to 2nd, 3rd and 4th period respectively. Number of valence electrons in Y is 7. Find the number of valence electrons in X and Z.

Maximum value of n+l +m for the last unpaired electron in an element present in 17th group and 4th period of periodic table: