Across
- 3. Subatomic particle with a neutral charge
- 4. Subatomic particle with a negative charge
- 7. number of protons/neutrons in an element
- 8. Solid, Liquid, Gas, Plasma
- 9. center of an atom made of protons and neutrons
- 10. Subatomic particles with a positive charge
- 14. the outermost electrons in an atom
- 16. two or more elements combined
- 17. The columns of the Periodic Table
- 18. bond between a metal and a nonmetal
- 19. A principle or description of observed events
- 20. The basic building blocks of all matter
- 21. Ionic or covalent
Down
- 1. The majority of the Periodic Table
- 2. Elements organized by properties
- 5. The energy of motion
- 6. bond between two nonmetals
- 11. a well tested hypothesis that is widely accepted
- 12. A pure substance that cannot be broken down
- 13. The rows of the Periodic Table
- 15. current model of the atom