Across
- 4. symbol symbol a one or two letter representation of an element
- 5. a system where matter can enter from or escape to the surroundings
- 7. when atoms gain or lose electrons to form a compound
- 9. a small number that represents the number of atoms for each element
- 10. matter made from a type of atom
Down
- 1. the substances that are present at the start of a reaction
- 2. a solid that forms from a solution during a chemical reaction
- 3. a system in which no matter is allowed to enter or escape
- 6. two or more atoms bonded together
- 8. an atom with an electric charge due gaining or losing electron