Across
- 2. when substances interact
- 4. electrons in the outermost shell of an atom
- 7. bond with a metal and a nonmetal
- 9. bond between two metals
- 10. set of chemical symbols
Down
- 1. a group of atoms bonded together
- 3. a compound or substance
- 5. the basic unit of a chemical element
- 6. bond with two nonmetals
- 8. connection between two surfaces