Oxygen Crossword Puzzle

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Across
  1. 1. the group in the periodic table that oxygen is a part of
  2. 3. the conversion of oxygen into carbon dioxide
  3. 6. A chemical element that does not have metallic properties which oxygen is a part of
  4. 7. part of the body where oxygen is stored
Down
  1. 1. An element in the periodic table that turns green when mixed with oxygen
  2. 2. vital for living
  3. 4. the process of releasing air
  4. 5. the process of taking in air