Across
- 1. Thomson Discovered the electron and experimented with the cathode ray tube.
- 3. Schrodinger Developed the wave equation to describe the electron's motion.
- 4. The recurring trends that are seen in the element properties.
- 9. Coined the term atom
- 10. Atom Has a nucleus consisting of a proton bearing one unit of positive electrical charges; and an electron bearing one unit of negative electrical charge, is also with the nucleus.
- 12. The one who discovered the Atom.
- 16. A subatomic particle with a positive electrical charge.
- 17. A small particle with a negative charge that is found in all atoms.
- 18. A form of a chemical element in which the atoms have the same number of protons but with different numbers of neutrons.
- 19. bonded together.
Down
- 1. Chadwick Confirmed the existence of neutrons.
- 2. Electrons orbiting the nucleus at fixed energy levels.
- 3. His discovery of canal rays aided in the discovery of protons later.
- 5. Rutherford Determined atoms mostly consist of empty space, being most of its mass exists in the Nucleus.
- 6. One of the three subatomic particles that make up an atom.
- 7. A substance created from combining two or more metals.
- 8. Different structural forms of the exact metal.
- 11. Molecules Molecules only containing 2
- 13. The structure in a cell that contains the chromosomes.
- 14. "The basic unit of chemical elements.
- 15. Dalton Built on Democritus' theory with the use of: evidence prom experiments showing atoms exist.