1
the principle stating that matter is not created or destroyed during a chemical reaction
2
shows the atom's symbol, mass number, and atomic number
3
The number of protons in the nucleus of an atom
4
the sum of the number of neutrons and protons in an atomic nucleus
5
the particles of the nucleus that have no charge
6
Atoms of the same element that have different numbers of neutrons.
7
Positively charged particles
8
A region that is located at the center of an atom and contains most of the atom's mass (protons and neutrons)
9
Smallest particle of an element than can exist alone or in combination with other atoms
