Across
- 4. the material made from the chemical equation NaCl
- 5. a particle with a negative charge
- 8. arranges elements into groups and periods
- 12. a particle with a positive charge
- 13. equal to the number of protons and neutrons
- 14. the horizontal (left to right) sections on the periodic table
- 15. the amount of matter in something
Down
- 1. the law of conservation of mass states matter cannot be...
- 2. the building blocks of life
- 3. particles with no charge
- 6. the vertical (up and down) sections on the periodic table
- 7. the number in front of a chemical formula
- 9. the basic units of elements and matter
- 10. represented on the periodic table by symbols
- 11. number 79 on the periodic table