A, B, and C are three elements with atomic numbers 6, 11 and 17 respectively : Which of these cannot form covalent bond ? Why ?

A, B, and C are three elements with atomic numbers 6, 11 and 17 respectively : Which of these can form ionic as well as covalent bond ?

A , B and C are three elements with atomic numbers 6, 11 and 17 respectively. i) Which of these from ionic bond ? Why ?

Elements X,Y have atomic numbers 9 and 12 respectively. Which one of these forms positive ion ?

Elements X, Y have atomic numbers 9 and 12 respectively. Which one of these a) forms negative ion ?

A, B and C are atoms of elements with atomic number Z, Z+1 and Z+2 respectively. If 'B' has octet configuration, the bond formed between 'A' and C predominently is

Which element cannot form a cation ?

Why HCI cannot form hydrogen bond.

A and B are elements with atomic numbers 16 and 17. Write different combinations of binary compounds known from them.

Which of the following elements A , B , C , D and E with atomic numbers 3 , 11 , 15 , 18 , and 19 respectively belong to the same group ?