Question

There are three elements X, Y and Z with atomic numbers 19, 8 and 17, respectively. What is the molecular formula of the compound formed between X and Z and give the type of chemical bond in the final compound?

Answer 1

X (atomic number 19) = Potassium (K)

Z (atomic number 17) = Chlorine (Cl)

Therefore, the molecular formula is KCl (potassium chloride).

Type of chemical bond: Ionic bond, formed by the transfer of one electron from potassium to chlorine.