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 comparing the relationship between elements, compounds, and molecules 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 statement is true because a molecule can consist of identical atoms (like O2, which is a molecule of oxygen) or different atoms (like H2O, which is a molecule of water, a compound).