Across
- 2. when the number of protons and electrons are equal
- 4. sized like protons but have NO electrical charge
- 5. two atoms with different number of neutrons
- 9. table with all elements found
- 10. an atom that carries an electrical charge
Down
- 1. model that electrons move in definite orbits around the nucleus
- 3. the number of the element which is the same number of protons
- 6. tiny particles that have a negative electrical charge
- 7. larger than electrons and have a positive charge
- 8. the center of an atom built up of protons and neutrons