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