Periodic Table

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Across
  1. 5. A substance that cannot be broken down into simpler substances by chemical means
  2. 6. found in column 1 of the periodic table
Down
  1. 1. colorless gases that are not reactive
  2. 2. primary creator of the first periodic table
  3. 3. a horizontal row of elements
  4. 4. Has properties of both metals and nonmetal