The Periodic Table

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Across
  1. 4. Organization of elements
  2. 5. Electrons that are in the outer-most energy level
  3. 8. Group 2 metals
  4. 9. Horizontal rows
  5. 10. Vertical columns, also called chemical families.
Down
  1. 1. Metals that have 1 valence electron
  2. 2. Russian chemist who organized the table by atomic mass
  3. 3. Conduct heat and electricity; found at the left of the staircase and bottom two rows
  4. 6. Group 18 gases that are rarely reactive.
  5. 7. Have 7 valence electrons