Across
- 5. Shiny, reflective and conducts electricity
- 8. Arranges elements by atomic number
- 9. Share properties of metals and non-metals
- 10. Positive particle found in nucleus
- 12. Dull, gases, that do not conduct electricity
Down
- 1. atoms with the same number of protons
- 2. Neutral particles in an atoms' nucleus
- 3. Element number 6 on periodic table
- 4. Found orbiting the nucleus
- 6. Element 31 on the periodic table
- 7. Smallest unit of matter
- 11. Electrons on the outermost level