CHEMISTRY CROSSWORD PUZZLE

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Across
  1. 2. FOUND IN BALLOONS ELEMENT
  2. 5. ORGANIC COMPOUND ELEMENT
  3. 7. KOALA BEAR—>KOALA MARSUPIAL
  4. 8. HEART EQUATION
Down
  1. 1. MATTER AND HOW IT CHANGES
  2. 3. BELOW—>NUMBER OF ATOMS
  3. 4. CARBON, HYDROGEN, NITROGEN…
  4. 6. LEAST REACTIVE ELEMENT