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Across
  1. 6. Radioactive elements in period 7
  2. 7. Shininess of a metal
  3. 8. Vertical column on the periodic table
  4. 12. Ability to attract electrons in a bond
  5. 15. Ability to carry heat or electricity
  6. 19. Ability to be drawn into wires
  7. 21. Element that is shiny and conducts electricity
  8. 22. earth metals Group 2 elements, reactive but less so
  9. 23. metals Group 1 elements, very reactive
  10. 24. metals Middle block elements with variable charges
Down
  1. 1. Group 17 elements, reactive nonmetals
  2. 2. law Element properties repeat in a pattern
  3. 3. Ability to be hammered into thin sheets
  4. 4. energy Energy needed to remove an electron
  5. 5. Introduced uncertainty principle
  6. 7. Rare earth elements in period 6
  7. 9. How easily an element combines with others
  8. 10. Element with properties of metals and nonmetals
  9. 11. Horizontal row on the periodic table
  10. 13. weight Average mass of atoms of an element
  11. 14. symbol One or two letters representing an element
  12. 16. Discovered the neutron
  13. 17. radius Size of an atom
  14. 18. gases Group 18 elements, very stable and unreactive
  15. 20. Element that is dull and poor conductor