Chemistry Crossword

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Across
  1. 3. An enzyme found in plant and animal cells.
  2. 4. The smallest part of an element that is representative of that element.
  3. 7. Invisible negatively charged particle that orbits the nucleus of an atom.
  4. 8. Vertical column of elements in the table.
  5. 10. Produced when two non-metals are combined.
  6. 13. Can be in-between metals and non-metals.
  7. 14. Produced when a metal and non-metal are combined.
  8. 15. Positively charged particle in the nucleus of an atom.
  9. 16. Came from the Greek word,"khemia" meaning juice of a plant.
  10. 17. Positive charges.
  11. 18. The number that represents the amount of atoms in a chemical formula.
  12. 19. Substances that start a reaction.
  13. 20. The positive charged centre of an atom.
  14. 23. A chemical change, which releases heat energy
Down
  1. 1. Anything that has mass and occupies space.
  2. 2. Substance(s) created by a reaction.
  3. 3. A slow chemical reaction in which the metal is decomposed when it reacts with oxygen.
  4. 5. Group 9, period 6.
  5. 6. Neutral particle in the nucleus of an atom.
  6. 9. The speed of a chemical reaction.
  7. 11. Measure of atomic mass; (amu).
  8. 12. Group 15, period 7.
  9. 21. An organic catalyst.
  10. 22. Horizontal row of elements in the periodic table.
  11. 24. Most reactive non-metals.