Across
- 2. Negatively charged particles
- 4. force The force involved with radioactivity
- 6. Neutral particles
- 7. force The strongest force; an attraction force
- 8. force The force of attraction of objects do to their masses
- 11. Particles that make up the protons and neutrons
- 13. Atoms that have the same number of protons, but different number of neutrons
- 15. number The number of protons and neutrons in the nucleus
Down
- 1. The smallest unit in which matter can be divided
- 2. force The force that results from the repulsion of the like change and the attraction of opposites
- 3. Atoms center
- 5. mass The weighted average of the masses of all the naturally occurring isotopes od an element
- 9. Positively or negatively charged atoms
- 10. mass unit Is one twelfth of the mass of an atom
- 12. number The number of protons in a nucleus
- 14. Positively charged particles