Vocabulary Review

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Across
  1. 3. representation of an object or system
  2. 6. the number of protons in the nucleus of an atom
  3. 8. indivisible
  4. 11. particles of a nucleus that have no charge
  5. 12. atoms that have the same number of protons but have different number of neutrons
  6. 13. the weighed average of the masses of all the naturally occurring isotopes of an element
  7. 14. the sum of the protons and neutrons in an atom
  8. 15. a unifying explanation for a broad hypothesis and observations that have been supported by testing
Down
  1. 1. are the positively charged particles of the nucleus
  2. 2. negatively charged particles found in all atoms
  3. 4. Mass Unit(amu) SI unit to express the mass of particles in atoms
  4. 5. center of an atom is a tiny, extremely dense, positively charged region
  5. 7. regions in an atom where electrons are likely to be found
  6. 9. smallest particle into which an element can be divided and still be the same substance
  7. 10. charged particles; are positively charged if the protons outnumber the electrons, and they are negatively charged if the electrons outnumber the protons