Across
- 2. the rows on a periodic table
- 5. pure substance on the periodic table
- 7. same number as protons
- 9. atomic mass-protons
- 10. the columns on a periodic table
- 12. something that is a conductor of electricity
Down
- 1. something that is dull and brittle
- 3. when 2 or more elements are physically combined
- 4. In between metals and nonmetals
- 6. same number as the atomic number
- 8. when 2 or more elements are chemically combined
- 11. what all objects on this earth are made of