Across
- 4. something that stands for represents or suggests another thing
- 5. They can combine to create a substance
- 6. Negatively-charged in orbit around the nucleus
- 8. Any material that have physical properties
- 9. All that have matter and space
- 10. Chemical elements organized by atomic number
Down
- 1. Rule expressed in symbols and mathematical symbols
- 2. Two or more substances that are mixed together but not chemically combined
- 3. Substance made of two or more different elements
- 7. Substance that cannot be broke into simpler substances