Chemistry

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Across
  1. 3. Outer layer of an atom
  2. 4. Vertical columns on the Periodic Table
  3. 5. two or more atoms bonded together
  4. 7. To shatter easily
  5. 9. Ability to reflect light
  6. 10. horizontal rows on the Periodic Table
  7. 11. Smallest unit of matter
Down
  1. 1. Used to identify the atom
  2. 2. Center of the atom
  3. 6. mass of 0 amu
  4. 8. A substance that consists of atoms that all have the same number of protons