Answer
a) form ionic bond.
b) form covalent bond.
c) form covalent bond.
d) form covalent bond.
Work Step by Step
Metals have the tendency to emit electron and form cation. On the other hand, non metals have the tendency to accept that electron and form anion. That's how ionic bond is formed and the compound becomes ionic compound. If both the elements are non metal they can share electrons to form covalent bond rather than emit or accept the complete electron. That's how covalent compound is formed.
a) potassium is a metal and oxygen is non metal. So, they will form ionic bond.
b) sulfur and carbon both are non metal. So, they will form covalent bond.
c) Bromine is non metal. So, two bromine atoms will form covalent bond.
d) carbon and oxygen both are non metal. So, they will form covalent bond.
