Chemistry

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Across
  1. 5. Elements in group 18
  2. 7. Waves associated with a moving particle
  3. 8. The study of absorption and emission spectra
  4. 9. Electrons apply singly before pairing
Down
  1. 1. Number used to describe the position and energy of an electron
  2. 2. Filled in order of increasing energies
  3. 3. Number of atoms in a mole
  4. 4. The principle that rules out the existence of definite paths
  5. 6. Atoms/ions with the same electron count