Periodic table and Atoms

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Across
  1. 3. A way of calling group 17.
  2. 4. A way of calling group 18.
  3. 5. Has a positive charge.
  4. 7. A way of calling group 2.
  5. 8. Horizontal on the periodic table.
  6. 9. Elements that are both metals and non metals.
  7. 10. Have the same amount of protons.
Down
  1. 1. A way of calling group 1.
  2. 2. Has a negative charge.
  3. 6. Across the periodic table.
  4. 7. The way of knowing how many protons.