Across
- 4. the amount of electrons on the outermost layer
- 5. anything that has mass and matter
- 8. a substance composed of two or more elements
- 9. Smallest unit of an element
Down
- 1. the ability to reflect light
- 2. the ability to be hammered into thin sheets
- 3. number in front of the chemical formula
- 6. how reactive an element is
- 7. center of an atom that has protons,neutrons,and electrons
- 8. the study of how atoms form new substances by interacting with each other