Across
- 2. The basic unit of a chemical element
- 5. He
- 6. H2O+NaCl
- 8. a thing that is composed of two or more separate elements; a mixture.
Down
- 1. a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
- 3. a substance made by mixing other substances together.
- 4. a part or aspect of something abstract, especially one that is essential or characteristic.
- 7. a mathematical relationship or rule expressed in symbols.
- 8. H2O
- 9. physical substance in general, as distinct from mind and spirit; (in physics) that which occupies space and possesses rest mass, especially as distinct from energy.