Lesson: Chapter 10 — Chemical Bonds

10.2. Covalent bonds 6 of 12 Reset answers

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Question 6

Which of these is a homoatomic molecule?

A O₂ B NH₃ C HCl D H₂O

The right answer is the one marked above.

O₂. A homoatomic molecule is built from atoms of one element only, and O₂ is two oxygen atoms.

Water, ammonia and hydrogen chloride each contain two different elements, which makes them heteroatomic. The number of atoms is irrelevant — what matters is whether they are all the same element.

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