Across
- 2. ability to burn or ignite
- 4. cloud outer layers of atoms made up of energy levels
- 7. amount of matter in a substance
- 8. has a positive charge
Down
- 1. ability to react with other elements
- 3. ability to be hammered into thin sheets
- 5. center of the atom
- 6. makes up all mater
- 8. level how acidic or alkaline basic a substance is compared to neutral