1. Atomic Structure

2. Electrons
Lightweight ( one million millionth of the mass of a speck of dust)
Negative charge
Surround the nucleus of an atom
Always moving
Can move in any direction within their shell or orbital
Is equal to the number of protons

3. Protons Found in the nucleus Positive charge
Mass is 1,836 times the mass of the electron and slightly less than the mass of the neutron
Identifies the atomic number

4. Mass is nearly 1,840 times that of the electron
Neutrons
Found in the nucleus
Has no electric charge
Mass is nearly 1,840 times that of the electron

5. - Equals the number of protons and neutrons in the nucleus