Periodic table

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Across
  1. 3. Electron in outer shell
  2. 5. A group of elements
  3. 6. The weighted average mass of the atoms
  4. 9. The quantity of energy that an isolated atomicnumber
  5. 11. Between metals and nonmetals
  6. 12. Row of chemical elements
  7. 13. Tendency of an atom
Down
  1. 1. Lack of metal attributes
  2. 2. diagrams that show the bonding between atoms
  3. 4. Measure of an element
  4. 7. High density,dutile, and high melting point.
  5. 8. Does not occur naturally on Earth
  6. 10. Consists of two atoms