Which statement BEST describes an element?
A
Elements are the smallest part of an atom.
B
Elements are made of one kind of atom and cannot be broken down into simpler substances.
C
An element can be made up of many different variations of atoms all with different numbers of protons.
D
Elements are made up of protons, neutrons, and electrons.
B
Elements are made of one kind of atom and cannot be broken down into simpler substances.