Periodic table

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Across
  1. 4. All elements in Group 1 react with this substance strongly.
  2. 6. As ions, metals have _____ electrons than protons.
  3. 7. The type of charge that this element in Group 2, Period 4 has as an ion.
  4. 8. The type of charge that nonmetals have.
  5. 10. Name of the element in Group 1, Period 3.
  6. 11. This is the atomic mass of the last element in Period 2.
  7. 12. The number of electrons that the negative ions in Period 3 always have.
  8. 13. This is the second last element in Period 2.
  9. 16. The number of electrons that a neutral atom of oxygen has.
  10. 17. This is the second last element in Group 2.
Down
  1. 1. The type of molecule that the second last Group of elements in the periodic table exist as naturally.
  2. 2. This element in period 1 typically has no neutrons.
  3. 3. This is the number of neutrons that the second element in Period 3 has.
  4. 5. The number of protons that aluminium (Al) has.
  5. 7. This element in period 3 forms a negative ion with a 3- charge.
  6. 9. The number of protons that this element in Group 1, Period 4 has.
  7. 14. This Group 1 element has four neutrons.
  8. 15. As a neutral atom, the number of protons that an element has _____ the number of electrons.