Atoms' Crossword Puzzle

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