Atoms and Periodic Table

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Across
  1. 3. families 1-2 and 13-18 on the periodic table
  2. 4. a gas with six valence electrons
  3. 6. describes solid non-metals
  4. 7. the smallest subatomic particle
  5. 8. a metalloid with six valence electrons
  6. 10. group two on the periodic table
  7. 12. have properties of both metals and non-metals
  8. 13. indicates the number of protons in an atom
  9. 14. most of the mass of an atom is located here
  10. 15. able to be hammered or pressed without breaking or cracking
  11. 16. stable elements that do not react easily with other elements
  12. 17. the number of valence electrons for phosphorus
  13. 18. a non-metal with four valence electrons
  14. 20. this atom has 32 protons
  15. 22. a horizontal row on the periodic table
  16. 23. a vertical column (family) on the periodic table
  17. 24. elements with seven valence electrons
Down
  1. 1. an element in period 3 that has seven valence electrons
  2. 2. found in the outermost energy level
  3. 3. shiny solids that conduct heat and electricity well
  4. 5. a solid non-metal halogen
  5. 9. the number of protons + neutrons in an element
  6. 11. highly reactive elements with one valence electron
  7. 19. the neutral subatomic particle
  8. 21. able to be drawn out into a thin wire
  9. 22. a charged subatomic particle found in the nucleus