UNIT 2 CHEMISTRY

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Across
  1. 2. Number of wave cycles that pass a give point per unit of time
  2. 5. Discovered the neutron
  3. 7. Stated that electrons can be found in specific circular paths orbiting the nucleus
  4. 11. The time required for one half of the nuclei in a radioisotope sample to decay
  5. 12. Fixed energies of an electron
  6. 13. Atoms that have the same number of protons but a different number of neutrons
  7. 14. Number of protons in the nucleus of an atom
  8. 16. Region of space in which there is a high probability of finding an electron
  9. 17. Total number of protons and neutrons in the nucleus of an atom
  10. 18. Electrons occupy orbitals of lowest energy first
  11. 19. Discovered electrons using a cathode ray tube
Down
  1. 1. Proposed that atoms were indestructible and indivisble
  2. 3. Ion with a positive charge (loses electrons)
  3. 4. Smallest particle of an element that retains its identity in a chemical reaction
  4. 6. A wave's height from zero to crest
  5. 8. Discovered the nucleus of an atom
  6. 9. Distance between crests
  7. 10. Determined the electron's charge and mass using the oil drop experiment
  8. 12. The way electrons are arranged in various orbitals around the nucleus of an atom
  9. 15. Attractive force that holds the nucleus together