Question

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 a covalent compound?

Options

• P and R

• Q and S

• P and S

• R and S

Answer 1

P and S

Explanation:

Element P (atomic number 6) has 4 valence electrons, and element S (atomic number 17) has 7 valence electrons, making both of them non-metals. Since non-metals react with each other by sharing electrons to achieve stability, they combine to form a covalent compound. Element R is a metal and element Q is an unreactive noble gas, so they cannot form covalent bonds.