Across
- 2. Mass in grams of one mole of a substance
- 4. Introduced the idea of the atom around 400 BC
- 6. credited with discovering the Neutron
- 8. One electron must occupy each orbital before pairing
- 10. electrons fill up the lowest available energy levels first
- 12. Atoms of the same element with different numbers of neutrons
- 13. use quantum numbers to show likely locations of electrons in atoms
- 15. These are important because they help hold protons together in the nucleus
- 18. electrons orbit the nucleus, much like planets orbit the sun
- 20. 6.022x10^23
- 22. used a magnet to determine the charge on the beam
- 23. When the nucleus of an atom is unstable, it releases particles and/or energy to become stable
- 24. Model of the atom that is accepted today
Down
- 1. assumed electrons were embedded in a positive ball
- 3. "No two electrons in the same atom can have the same set of quantum numbers
- 5. Number of moles of a solute divided by liters of solution
- 7. Atoms with a charge
- 9. combined ideas of others to form an atomic theory
- 11. a way to easily convert between units in an organized manner
- 14. He discovered the electron
- 16. This explained why electrons don't crash into the nucleus: electrons can only exist at certain energy levels around the nucleus- their energies are quantized
- 17. These have the smallest mass
- 19. He discovered the positively charged proton in the nucleus
- 21. a unit of measurement that is the amount of a pure substance containing the same number of chemical units