Across
- 2. an atom with lost or gained electrons
- 4. same element, different mass
- 8. the scientist who invented the "Billiard Ball Mode"
- 9. Subatomic particle with a neutral charge
- 10. subatomic particle with a positive charge
- 12. means atom in greek
- 15. atom or molecule that gained or lost an electron
- 16. a positively charged ion
- 17. The scientist that discredited Leucippus and Democritus
- 19. chemist that discovered the orbital model
- 20. a mathematical expression to find the wave function
Down
- 1. who discovered the electron
- 3. substance that cannot be broken down into a smaller substance
- 5. Subatomic particle with a negative charge
- 6. the sum of protons and neutrons on the periodic table
- 7. rejected the idea of only four elements
- 11. electrons at the out edge of the shell
- 13. a chemical bond of two elements
- 14. type of model that includes element symbol as the nucleus
- 18. drop experiment to find charge and mass of the electron