The smallest piece of matter.
The positive subatomic particle of an atom.
The neutral subatomic particle of an atom.
The core of the atom that contains the protons and the neutrons.
The negative subatomic particle of an atom that orbits the nucleus.
A substance made up of entirely of one kind of atom.
A chart that organizes the elements.
A substance made up of only one kind of atom or molecule
A combination of two or more atoms.
A combination of two or more different kinds of atoms.