science crossword :)

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Across
  1. 4. Outermost electrons that determine chemical reactivity
  2. 5. Lowest downward point or valley of a wave
  3. 8. Number of wave cycles passing a fixed point per second
  4. 10. Classic acronym identifying the visible spectrum colors
  5. 11. Atoms of one element with different neutron numbers
  6. 14. Danish physicist who modeled electrons in circular orbits
  7. 16. Negatively charged ion formed by gaining electrons
  8. 18. Emission of electrons from metal struck by light
  9. 22. Three-dimensional region where finding an electron is probable
  10. 24. Minimum discrete packet of energy an atom can absorb
  11. 25. High energy state reached after absorbing a photon
Down
  1. 1. Prism device used to view atomic emission lines
  2. 2. Positively charged ion formed by losing electrons
  3. 3. Positive subatomic particle inside the nucleus
  4. 6. Lowest possible energy state for an atomic electron
  5. 7. Clockwise or counterclockwise magnetic property of electrons
  6. 9. Neutral subatomic particle located in the nucleus
  7. 12. Dumbbell-shaped sublevel containing three spatial orientations
  8. 13. Discrete packet or particle of electromagnetic radiation
  9. 15. Distance measured between two consecutive wave crests
  10. 17. Dense central core containing an atom's mass
  11. 19. Negative subatomic particle discovered by Thomson
  12. 20. Hydrogen spectral transition series emitting visible light
  13. 21. Spherical sublevel found in every principal energy shell
  14. 23. Highest point or peak of an electromagnetic wave