Periodic Table

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Across
  1. 3. (2 words) all of the known elements on a chart in order of increasing number of protons
  2. 4. located on right side of periodic table (plus hydrogen)
  3. 7. the horizontal rows on periodic table; tell how many energy levels an element has
  4. 9. located along "staircase" on periodic table
Down
  1. 1. these elements are the least reactive (2 words, includes a number word)
  2. 2. most abundant type of element; located on left side of periodic table
  3. 5. the vertical columns on periodic table; tell how many valance electrons an element has
  4. 6. these elements are the most reactive (2 words, includes a number word)
  5. 8. another word for a group on the periodic table