Write the formula of the product formed when the element A (atomic number 19) combines with the element B (atomic number 17) Draw its electronic dot structure. What is the nature of the bond formed ?

Explanation

The electronic configuration of element A with atomic number 19 would be 2, 8, 8, 1. Hence it is potassium. Since, it has only one valence electron therefore it must be a metal.
The electronic configuration of element B would be 2, 8, 7 with number of valence electrons being 7. So, it must be a non-metal that is chlorine.
A metal and a non-metal usually combine through ionic bond because metals have tendency to lose electrons and form cations whereas non-metals can accept electrons to form anions.
Potassium and chlorine will form potassium chloride (KCI).
The electron dot structure of KCI is as given below :