Chemistry Unit 2

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Across
  1. 2. Mass in grams of one mole of a substance
  2. 4. Introduced the idea of the atom around 400 BC
  3. 6. credited with discovering the Neutron
  4. 8. One electron must occupy each orbital before pairing
  5. 10. electrons fill up the lowest available energy levels first
  6. 12. Atoms of the same element with different numbers of neutrons
  7. 13. use quantum numbers to show likely locations of electrons in atoms
  8. 15. These are important because they help hold protons together in the nucleus
  9. 18. electrons orbit the nucleus, much like planets orbit the sun
  10. 20. 6.022x10^23
  11. 22. used a magnet to determine the charge on the beam
  12. 23. When the nucleus of an atom is unstable, it releases particles and/or energy to become stable
  13. 24. Model of the atom that is accepted today
Down
  1. 1. assumed electrons were embedded in a positive ball
  2. 3. "No two electrons in the same atom can have the same set of quantum numbers
  3. 5. Number of moles of a solute divided by liters of solution
  4. 7. Atoms with a charge
  5. 9. combined ideas of others to form an atomic theory
  6. 11. a way to easily convert between units in an organized manner
  7. 14. He discovered the electron
  8. 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
  9. 17. These have the smallest mass
  10. 19. He discovered the positively charged proton in the nucleus
  11. 21. a unit of measurement that is the amount of a pure substance containing the same number of chemical units