The atomic numbers of four elements P, Q, R and S are 6,10,12 and 17 respectively. Which two elements can combine to form covalent compounds?
The atomic numbers of four elements P, Q, R and S are 6,10,12 and 17 respectively. Which two elements can combine to form covalent compounds?

(a) P and R

(b) Q and S

(c) P and S

(d) R and S

Solution:

Option (c) is the answer because the atomic numbers of the four elements P, Q, R, and S are 6,10, 12, and 17 respectively. P (6= 2,4) and S (17= 2,8,7) are the two elements that can interact to produce covalent compounds.