Which statement describes a physical property related to the particles that make up a material?
A. Carbon is flammable because its atoms combine easily with
oxygen atoms in the presence of heat.
B. Fluorine is highly reactive with other elements because its atoms
have 7 valence electrons.

C. Neon is not reactive with other elements, because its atoms have
8 valence electrons.
D. Gold is a relatively dense metal because its atoms have more
protons than atoms of many other metals.