Matter

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Across
  1. 4. Anything that has mass and volume
  2. 6. A mixture where all substances look the same throughout
  3. 7. The amount of protons + neutrons
  4. 8. 2 or more atoms that are chemically combined
  5. 11. Electron located on the outer shell of an atom
  6. 13. The building block of all matter
  7. 15. Charge-less particle of an atom
Down
  1. 1. Number of protons in an atom
  2. 2. A mixture w/ visibly different substances throughout
  3. 3. 2 or more substances that are physically combined
  4. 5. A molecule that is made of 2 or more different types of atoms
  5. 9. A molecule that is made up of only 1 type of atom
  6. 10. Average mass of isotopes(types)of an atom
  7. 12. Negatively charged moving particle of an atom
  8. 14. Positively charged particle of an atom