Across
- 1. A planetary model
- 4. A table of the chemical elements
- 5. Pure substance that is made of one or more element that are chemically bonded together
- 9. A substance that cannot be broken down into any other substance
- 12. A negative charged subatomic particle
- 13. A particle that consists of a nucleus of protons and neutrons
- 14. Elements that are considered semi-metals
- 15. Elements that belong to group 18 of the periodic table
Down
- 2. Simplest and lightest element to exist
- 3. A stable subatomic particle
- 6. The result of combining two or more substances that do not react chemically
- 7. A neutral charged subatomic particle
- 8. Any of the six chemical elements that make up Group 1 (Ia) of the periodic table
- 10. Elements that do not display the properties of metal
- 11. A substance with high electrical conductivity, luster, and malleability.