Across
- 2. Weight - average mass of the naturally
- 4. mass number- number of protons
- 6. tiny,very light particles
- 9. have no electrical charge
- 10. electron than proton =(+) positive charge;
Down
- 1. mass number- equal to the number of protons plus
- 3. electrons-an electron in the outermost energy level of an atom.
- 5. carries an electrical charge is called an
- 7. much larger and heavier than elections
- 8. level- any of the possible energies