Periotic table

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Across
  1. 2. Verticle column on the periodic table.
  2. 4. What group is potassium in?
  3. 8. what is the classification of sodium?
  4. 9. what element is in period 1 group 6?
  5. 11. What element is in group 1 and period 1?
  6. 12. Positive particles in the nucleus.
  7. 14. Neutral particle in the nucleus with protons.
  8. 17. Tells the number of protons in an atom of the element.
  9. 20. The smallest particle in an atom.
Down
  1. 1. A table organizing all of the elements known to exist by atomic number and chemical properties.
  2. 3. Negative particle outside of the nucleus.
  3. 5. Properties of both metals and nonmetals.
  4. 6. Horizontal row on the periodic.
  5. 7. The basic unit of a chemical element.
  6. 10. What is the name of the group helium is in?
  7. 13. An element with an atomic number of 16.
  8. 15. How many valence e- does Magnesium have?
  9. 16. How many valences e- does group one have?
  10. 18. Tells the number of protons and neutrons in the nucleus.
  11. 19. What element is in period 2 and in the alkaline earth metal group?