Chemistry Basics

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Across
  1. 4. atomic mass (rounded) minus atomic number
  2. 6. when an atom has a charge
  3. 9. similar to how magnets attract to opposite poles
  4. 10. measured in atomic mass units
  5. 11. charge of a nucleus
  6. 12. held together by the strong force
  7. 15. charge of 2/3
  8. 16. elements with the same number of protons but a different number of neutrons
  9. 17. number of protons and electrons
  10. 18. atoms are illustrated using this model
Down
  1. 1. holds quarks together
  2. 2. electrons are shared
  3. 3. chemical combination of two or more elements in definite proportions
  4. 5. charge of -1/3
  5. 7. a pure substance that consists entirely of one type of atom
  6. 8. outer most orbital
  7. 11. positive charge
  8. 13. negative charge
  9. 14. made of protons, neutrons, and electrons
  10. 16. electrons are transferred or given away