Across
- 3. major component of atmosphere
- 4. period number of erbium
- 6. d and f blocks
- 8. abundant metal in meteorites
- 9. hydrogen-3
- 11. not a dime
- 13. major bone constituent
- 15. 79 protons
- 16. protons plus neutrons
- 18. alkaline earth
- 19. silliest element
- 20. high energy light rays
- 22. invented periodic table
- 24. found in electrical wire
- 26. where protons are found
- 27. pencil lead
- 29. equals atomic number
- 30. inert gas
Down
- 1. positive electron
- 2. occurs at regular intervals
- 5. unreactive
- 7. unstable nucleus
- 10. last naturally-occurring element
- 12. helium-4 nucleus
- 14. same protons different neutrons
- 17. where elements are made
- 19. alkali metal
- 20. periodic table columns
- 21. conducts electricity
- 23. part of scientific notation
- 25. neutral charged particle
- 28. halogen