Química: Elementos Químicos

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Across
  1. 3. Essential gas for respiration (6 letters)
  2. 5. Lightest and most abundant element in the universe (8 letters)
  3. 6. Element that forms the basis for organic life (6 letters)
Down
  1. 1. Noble gas used in brightly colored signs (4 letters)
  2. 2. Metal used to make steel, symbol is Fe (4 letters)
  3. 4. Precious metal with the symbol Au (4 letters)