Question

Which set of atoms will form an ionic compound?

A) one calcium atom with an oxygen atom
B) two hydrogen atoms with one oxygen atom
C) one oxygen atom with another oxygen atom
D) two phosphorous atoms with five oxygen atoms

Answer 1

The answer is A)

Step-by-step explanation:

An ionic compound is formed when one atom donates one or more electrons to one or more atoms of another element. Calcium has two valence electrons, which are donated to an atom of oxygen. So, an ionic compound is formed in the reaction involving one calcium atom with an oxygen atom.