Across
- 3. created by a reactant
- 6. turns blue in universal indicator
- 7. substances on the periodic table
- 9. protons, neutrons, and electrons
- 10. determined by valence electrons
Down
- 1. contains protons and neutrons of an atom
- 2. gases with the lowest reactivity
- 4. one of two elements that is a liquid at room temperature
- 5. father of the periodic table
- 8. vinegar or citrus