Chemistry unit 2

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Across
  1. 3. positive charge particle found in the nucleus
  2. 6. number of protons in the nucleus of an atom
  3. 8. composition percent by mass of each element in a compound
  4. 9. simplest whole-number ratio of atoms of each element in a compound
  5. 13. atom that gains 1 or more electrons will exhibit a negative charge
  6. 14. positive charged atoms when an atom loses 1 or more electrons
  7. 15. same as or simple integer multiple of the empirical formula
  8. 17. atoms of the same element that differ in mass
  9. 19. central core of an atom
Down
  1. 1. alternative mass unit that is equivalent to the (u)
  2. 2. negative charged with a mass more than one thousand-times less of that of an atom
  3. 4. uncharged particle with a mass approx the same as that of protons
  4. 5. abbreviation to indicate an element
  5. 6. equal to its mass (whole number)
  6. 7. summing the average atomic masses to all of the atoms represented
  7. 10. amount unit similar to familiar units
  8. 11. 6.022x10^23
  9. 12. total number of protons and neutrons in an atom
  10. 16. consist 2 protons and 2 neutrons
  11. 18. exactly 1/12 of the mass of a single atom of the carbon-12 isotope