Across
- 1. includes helium, krypton, neon, and more
- 3. distance between wave crests
- 8. the letter representation of an element
- 10. the smallest part of an element
- 11. type of charged particle
- 12. lowest amount of frequency
- 14. highest amount of frequency
- 15. type or structure that deals with the valence electrons
- 17. horizontal row on the periodic table
- 19. positively charged particle
- 20. positively charged item of the nucleus
- 21. type of diagram that has up and down arrows
- 22. number of waves that pass a certain point per unit of time
- 24. chemical substance that cannot be broken down
Down
- 2. theory that all substances are composed of atoms
- 4. number of protons in the nucleus of an atom
- 5. where protons and neutrons stay
- 6. the whole arrangement of elements
- 7. same protons different neutrons
- 9. outer layer of electrons
- 10. negatively charged particle
- 13. negatively charged item in a nucleus
- 16. vertical row on the periodic table
- 18. total number of protons and neutrons in the nucleus of an atom
- 23. neutral charge in a nucleus