Matter

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Across
  1. 1. atomic mass minus atomic number
  2. 4. the numbers in chemical formulas
  3. 6. different versions of the same element
  4. 8. its chemical symbol is O
  5. 10. negative charge orbits the nucleus
  6. 12. neutral charge, found in the nucleus
  7. 14. positive charge, in the nucleus
  8. 15. the building blocks of matter
  9. 16. matches the number of protons in an atom
Down
  1. 2. center of the atom, home to protons and neutrons
  2. 3. anything that has mass and takes up space
  3. 5. the atomic number tells us the amount of these
  4. 7. a pure substance made from one type of atom
  5. 9. compounds are expressed using symbols and numbers
  6. 11. made from 2 or more elements
  7. 13. each element has a unique one of these