Across
- 2. Have a positive electrical charge
- 4. Number of protons in an atom
- 5. Sometimes called the wave model
- 6. Any of the possible energies an electron may have in an atom
- 9. Two atoms with different numbers of neutrons are called
- 10. Equal to the number of protons and neutrons
Down
- 1. An electron in the outermost energy level of an atom
- 3. Have no (0) charge
- 7. Have a negative electrical charge
- 8. Average mass of the naturally occurring isotopes of an element