Chemistry

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Across
  1. 2. Substance that donates protons in a chemical reaction
  2. 4. A reaction where substances combine with oxygen and release energy
  3. 6. a term used in fiction, engineering, and common situations for a material ideal for a particular application but impractically difficult or impossible to obtain
  4. 7. Transition metal with symbol "Pt", used in catalytic converters
Down
  1. 1. A substance that speeds up a chemical reaction without being consumed
  2. 3. Halogen with atomic number 17, commonly used in disinfectants
  3. 5. Synthetic element with atomic number 101, named after a famous chemist
  4. 8. Radioactive element used in nuclear fuel with atomic number 92