Across
- 3. the amount of evidence released when atoms split.
- 4. the elements forming more than one compound have ratios by mass in small whole numbers.
- 5. number of protons in the nucleus of the atom
- 7. identifies the total number of protons and neutrons in the nucleus of an atom.
- 12. discovery of protons
- 13. (350 Bc) Greek Philosopher.
- 15. electrons must be present in all types of…
- 18. Average Atomic mass: the weighted average mass of the atoms in naturally occurring sample of that element.
- 19. (1808) developed the Atomic Theory.
- 20. used logic and reasoning and not scientific methodology (it didn’t exist yet)
- 22. regardless of the size of the sample,the elements w/in the compound always have the same proportion by mass.
- 23. regardless of the gas contained in the tube or the metal used for the electrodes the results were…
- 24. 2. Nuclei of atoms can be split ( atomic bomb)
Down
- 1. elementary particles that combine to form other subatomic particles, such as protons and neutrons( generally six different type)
- 2. discovery of the Electrons using the cathode ray.
- 6. (Atoms are not…) 1. Atoms composed of subatomic particles
- 8. smallest particle of an element (unable to be cut)
- 9. the reason why Atoms of the same element may be different.. and # of neutrons.
- 10. C. Discovery of Neutrons (1932) developed nuclear weapons
- 11. determined the charge and mass of an electron.
- 14. discovery of the nucleus
- 16. Explains the what happens as a pattern while scientific theories: attempt to explain how or why the events occur.
- 17. neutral: atoms
- 21. Hyphen notation ex: Hydrogen-1,Carbon-12( mass #)
- 22. matter is neither created nor destroyed.