Periodic Table

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Across
  1. 7. primary creator of the first periodic table
  2. 9. good conductors of heat and electricity
  3. 11. Atoms of this family have 4 valence electrons
  4. 12. total number of protons and neutrons in the nucleus of the atom
  5. 14. colorless gases that are not reactive
  6. 15. arranged the elements in order by atomic number
  7. 16. the number of protons in the nucleus of an atom
  8. 19. found in column 1 of the periodic table
  9. 20. vertical columns of elements with similar properties
Down
  1. 1. This family includes a metalloid (Boron), and the rest are metals .
  2. 2. electrons in the outermost energy level
  3. 3. this group include include magnesium and calcium, among others
  4. 4. elements in families 3-12
  5. 5. poor conductors of heat and electricity
  6. 6. Has properties of both metals and nonmetal
  7. 8. Named after the element that makes up 78 % of atmosphere
  8. 10. a horizontal row of elements
  9. 13. only nonmetal on the left side of the Periodic Table
  10. 17. A substance that cannot be broken down into simpler substances by chemical means
  11. 18. nonmetallic elements in group 17 that have colored vapors
  12. 21. Most elements in this family are active when forming compounds