Periodic Table

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Across
  1. 3. first element to be made artificially
  2. 6. scientists used this to weigh the elements
  3. 7. the highest unexcited energy level for an electron
  4. 8. the number of elements found in nature
  5. 9. who first introduced the periodic table
Down
  1. 1. decreases from top to bottom and left to right
  2. 2. what the rows on the periodic table are called
  3. 4. each one of these is a unique type
  4. 5. opposites of the table do this
  5. 10. type of most elements on the periodic table