Chemistrry?

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Across
  1. 6. any combination of atoms chemically joined together
  2. 8. The basic unit of a chemical element
  3. 10. A type of matter defined by a unique partical
  4. 12. any combination of atoms chemically joined together
  5. 13. Energy level; an orbit followed by electrons around an atom's nucleas
  6. 15. O, atomic number 8
  7. 16. The energy of motion
Down
  1. 1. Matter is made up of _________ too hard to see
  2. 2. The number of protons in an element
  3. 3. A one or two letter code that identifies an element
  4. 4. Atoms with same amount of protons and different amount of nuetrons
  5. 5. The guy who invented the first from of the periodic table
  6. 7. Ra, atomic number 88
  7. 9. The most awesome person in the world
  8. 11. Holmium, Erbium, cerium, and Terbium all belong to the _____________________ section on the periodic table
  9. 14. The decrease of gas volume as a result of applied force