Across
- 2. a compound in which the atoms are held together by covalent
- 3. Atoms of the same element with different numbers of neutrons
- 4. atom that has
- 6. particles that have NO charge
- 8. forms when atoms share electrons
- 9. an electric charge
- 11. is an electrical attraction between two oppositely
- 13. positively charged particles
- 14. ions
Down
- 1. negatively charged particles
- 3. given up or gained one or more electrons becomes an _____ and
- 5. the center of the atom where the neutrons and protons are located
- 7. a pure substance that cannot be broken down into other substances
- 10. building blocks of matter
- 12. When two or more elements combine