Across
- 4. The type of bond that holds sodium and chlorine together in table salt.
- 7. The ___ molecular theory explains why gases expand when heated: particles are always moving.
- 8. A statement that always seems true in nature, like gravity.
- 10. Particle that has no charge but adds mass inside the nucleus.
- 11. The outermost electrons that decide how atoms bond
Down
- 1. A tested explanation for natural events, such as plate tectonics or the atomic model.
- 2. A chart that organizes elements by properties and atomic number.
- 3. The dense center of an atom where protons and neutrons are found.
- 5. Type of bond formed when two hydrogen atoms share electrons with oxygen in water.
- 6. The smallest unit of matter, making up everything around you.
- 9. The particle with a positive charge inside the nucleus.