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