Across
- 2. solid, liquid, gas and _____
- 4. molecules are closely packed and mostly still
- 8. element with 4 energy levels and 1 valence electron
- 11. gases elements with completely filled valence shells
- 12. atom with the same number of protons but a different number of neutrons
- 14. element with 3 energy levels and 2 valence electrons
- 16. phase change from gas to solid
- 19. the fifth element
- 20. gases like nitrogen, hydrogen and oxygen
- 21. element with the highest mass number
- 22. element with 6 valence electrons and mass 16
- 23. shiny and good conductors, are on the left side of the periodic table
- 24. the smallest element
Down
- 1. most reactive group on the periodic table
- 3. element with 13 protons
- 5. phase change from solid to gas
- 6. SI unit for mass
- 7. subatomic particle with no charge
- 9. GHS symbol with skull bones
- 10. ventilated cabinet for working with fumes
- 13. subatomic particle with a positive charge
- 15. not valence electrons but the other type
- 17. element with 77 protons
- 18. when you breath in a chemical