Four elements W,X,Y and Z contain 8,11,9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be :

The element having atomicity 'four' is most likely to be :

The atomic numbers of four elements A,B,C and D are 12,13, 15 and 3 respectively. The element which cannot form a cation is :

Two elements X and Y have valencies of 5 and 3, and 3 and 2, respectively. The element X and Y are most likely to be respectively :

Atoms of elements R, S and T have 8, 9 and 11 protons respectively. Neon has 10 protons. What is the formula of a molecule of R?

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms an anion

Elements X, Y and Z have atomic numbers 6, 9 and 12 respectively. Which one : forms a cation

The atomic number of elements A and B is 9 and 17 respectively. Why is element a better oxidant than B?

The atomic numbers of three elements X, Y and Z are 9, 11 and 17 respectively. Which of these two elements will show similar characteristics and why ?