Across
- 1. Where electrons reside
- 5. Negatively charged particle orbiting the nucleus
- 6. Contributes to atomic mass
- 8. How easily a substance undergoes a chemical change
Down
- 2. Pure Substance made up of only 1 atom
- 3. A horizontal row on the Periodic table
- 4. Determines the atomic number
- 7. A vertical column on the periodic table