Chemistry

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Across
  1. 5. The staircase column highlight in the Periodic Table
  2. 8. Number of protons and electrons
  3. 9. Can't be changed (rust)
Down
  1. 1. Can be changed back. (water, ice, water vapor)
  2. 2. On the right to center sides on the Periodic Table
  3. 3. The periodic Table of elements are all considered...
  4. 4. Its a pure substance, not an element but a...
  5. 6. On the left side on the Periodic Table
  6. 7. You find this in the Periodic Table
  7. 10. Physical combination of 2 or more substances