Across
- 3. A substance formed as a result of a chemical reaction
- 4. A negatively charged particle found orbiting the nucleus
- 6. The central part of an atom containing protons and neutrons
- 8. A measure of how much matter an object contains
- 10. The smallest part of an element that can exist
- 11. A substance that takes part in and undergoes change during a chemical reaction
Down
- 1. A positively charged particle found in the nucleus of an atom
- 2. A neutral particle found in the nucleus of an atom
- 5. A pure substance made of only one type of atom
- 7. A substance made when two or more elements are chemically joined
- 8. Two or more atoms chemically bonded together
- 9. A substance that speeds up a chemical reaction without being used up