Across
- 1. small number representing the number of atoms for each element
- 4. a single type of matter made of one type of atom
- 6. two or more atoms bonded together
- 7. system where matter cannot enter or escape
- 8. substances present at the end of a reaction
- 9. system where matter can enter from or escape to the surroundings
Down
- 2. type of matter consisting of two or more different elements bonded together
- 3. atom with an electric charge due to gaining or losing electrons
- 5. substances present at the start of a reaction
- 10. an atom no longer reacts with other elements