Part B

Question

Which statement comparing the relationship between elements and compounds to molecules is true?
A.
A molecule can be composed of two or more atoms of the same element, like O2
, or atoms of more than one element, like all compounds.
B.
A molecule is only composed of two or more different elements, like all compounds, but two atoms of the same element cannot form a molecule.
C.
A molecule is the simplest form of matter and is the building block of both elements and compounds.
D.
A molecule is composed of two or more atoms of the same element, like O2
, but atoms of more than one type of element cannot form a molecule.

Answer 1

The correct statement is:

A. A molecule can be composed of two or more atoms of the same element, like O₂, or atoms of more than one element, like all compounds.

This is true because a molecule can indeed consist of two or more atoms that are either of the same element (e.g., O₂, N₂) or different elements (e.g., H₂O, CO₂), which are considered compounds.