Periodic table crossword

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Across
  1. 4. Elements that are not metal
  2. 9. metallic bond between atoms
  3. 10. has a positive energy charge
  4. 11. gases the 6 naturally occurring elements are called
Down
  1. 1. housing of the cell
  2. 2. defines a chemical element
  3. 3. have a mass slightly grader than a proton
  4. 5. The basic unit of chemical elements
  5. 6. each of two or more of the same element.
  6. 7. mass mass of the atoms
  7. 8. have a negative energy charge