The Periodic Table 2

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12345678910111213141516171819202122
Across
  1. 1. A metal that melts at just above room temperature
  2. 3. A precious white metal with high electrical conductivity
  3. 6. An atom’s tendency to attract shared electrons
  4. 8. A noble gas commonly used in lighting and welding
  5. 9. TABLE The organized chart of elements arranged by atomic number
  6. 11. Radioactive elements from atomic numbers 89 to 103
  7. 14. A lightweight, silvery metal used in cans and aircraft
  8. 15. Highly reactive nonmetals in Group 17 of the periodic table
  9. 18. The only liquid nonmetal at room temperature
  10. 19. A rare transition metal often used in catalytic converters
  11. 20. A metal used to galvanize steel against corrosion
  12. 21. A toxic metal that is liquid at room temperature
Down
  1. 2. Rare earth metals from atomic numbers 57 to 71
  2. 4. ELECTRONS Outer electrons that determine an atom’s reactivity
  3. 5. NUMBER The count of protons that defines each element
  4. 7. SHELLS Regions around the nucleus where electrons orbit
  5. 10. A reactive nonmetal essential for ATP and DNA
  6. 12. MENDELEEV The Russian chemist who pioneered the first periodic table
  7. 13. EARTH METALS Metals in Group 2 that readily form compounds
  8. 16. A dense, soft metal historically used as currency
  9. 17. A yellow nonmetal known for forming odorous compounds
  10. 22. A greenish-yellow halogen used as a disinfectant