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