Question

Ozone is formed when _______. a. two oxygen molecules combine b. an individual oxygen atom combines with an oxygen molecule c. ultraviolet radiation breaks apart four oxygen molecules d. oxygen molecules are broken into separate atoms

Answer 1

Yea the answer would be B

Answer 2

Answer: b. an individual oxygen atom combines with an oxygen molecule

Explanation:

Molecules of an element is a pure substance which is  composed of atoms of similar elements. Example: $O_2$

Atom is the smallest entity of a matter which has its independent existence.

$O_2+O\rightarrow O_3$

Ozone is a molecule of oxygen which contains 3 oxygen atoms and hence is formed by the combination of a molecule of oxygen and a atom of oxygen.

Hence the correct option is b.