Periodic Table Vocabulary

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Across
  1. 2. pure substance only containing one atom
  2. 5. The smallest unit of an element
  3. 7. group 3-12 elements
  4. 9. group 1 elements; most reactive element group
  5. 10. group 2 elements; less reactive than group 1
Down
  1. 1. a chart of all the known elements on earth
  2. 3. rows on the periodic table; organized by element energy levels
  3. 4. columns on the periodic table; organized by valence electrons
  4. 6. Created one of the first periodic table; organized by atomic mass
  5. 8. able to be pulled into long things