The Atom - Crossword

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