Across
- 2. symbol The abbreviation of the element
- 4. An atom that's negative due to gaining electrons
- 5. The number of protons plus neutrons
- 8. The system of electrons surrounding the nucleus of an atom
- 9. A variation with different numbers of neutrons
- 11. An atom that's positive due to losing electrons
- 13. positive electrical charge found in the nucleus
- 15. Negative electrical charge found in the Electron cloud
Down
- 1. The creator of the Atomic Theory
- 3. Developed the first atomic model, known as the solid sphere model in 1803
- 6. small, dense positively charged center
- 7. No electrical charge but still found in the nucleus
- 10. description of the structure of atoms
- 12. Number The number of protons and electrons
- 14. An atom that has gained or lost electrons