Across
- 1. the 98 element of the periodic table
- 4. have a negative charge and a mass of zero
- 5. A substance that consists of atoms that have the same number of protons
- 6. the 54 element of the periodic table
- 9. ability to burn or ignite
Down
- 1. A substance composed of two or more elements
- 2. ability to be hammered into thin sheets
- 3. Smallest unit of matter
- 7. ability to dissolve or be dissolved
- 8. center of the atom