periodic table

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Across
  1. 5. verticle column on the periodic table
  2. 8. 3-12 are considered what
  3. 9. What gorup is magnesium in
  4. 12. Cl is in what group
  5. 13. an element with an atomic number of 20
  6. 16. what is in period 3 and a mettalloids
  7. 17. table organizing all the elements known to exist by atomic number and chemical properties
  8. 19. how many velence e- does Beryllium have
Down
  1. 1. group 3 period 13
  2. 2. NaCl is also known as what
  3. 3. what is the same as electrons in an atom
  4. 4. horizontal column on the periodic table
  5. 6. properties of both nonmetals and nonmetals
  6. 7. how many protons do Sulfur, S, have
  7. 10. what plus protons equals the mass number
  8. 11. Group 13 has how many valence e-
  9. 13. what group is Silicon, Si, in
  10. 14. what is in period 2 in the halogens group
  11. 15. what is the name of group 18
  12. 18. tells the number of protons an atom