Science for fun

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Across
  1. 4. table, list of elements
  2. 6. Negative charge
  3. 8. atom making 4 elements
  4. 9. weight/mass, weight of all elements
  5. 10. a positive charge
Down
  1. 1. substance that is not metal
  2. 2. natural gas
  3. 3. number, number of proton in the nucleates of an atom
  4. 5. hard substance/element
  5. 7. A negative charge
  6. 9. Basic unity of a chemical element