1. made of two protons and two neutrons

2. similar to an electron; positive charge

3. orbits nucleus; negative charge

4. bundle of energy; zero charge

5. found in nucleus; positive charge

6. very unstable; +, -, or zero charge

7. found in nucleus; zero charge

8. negative particle; negative charge

9. atomic energy converted to mass

electron

gamma

neutrino

meson

positron

beta

neutron

proton

alpha