A molecule is

A) a combination of atoms held together by chemical bonds.
B) a positively charged ion.
C) a negatively charged ion.
D) a substance that conducts electricity when placed in solution.
E) an alteration in the three-dimensional structure of a protein.

Chemical Bonds

The attractive forces that hold atoms together in molecules or crystals, forming as a result of sharing or transferring electrons between atoms.

Molecule

The smallest particle of a chemical substance that can exist independently while retaining the chemical properties of the substance.

Atoms

The basic unit of a chemical element, consisting of a nucleus of protons and neutrons, and surrounded by electrons.