Across
- 2. A sphere made up of carbon atoms
- 4. A strong, hard magnetic silvery-grey metal, the chemical element of atomic number 26, much used as a material for construction and manufacturing, especially in the form of steel. Iron
- 9. Groups of elements with similar properties
- 10. Substance made up two or more different elements bonded together
- 11. Cannot be separated into simpler substance by physical or chemical means
- 12. Substances that are not chemically combined
- 13. The hardest material on earth and is made of pure carbon
Down
- 1. nanotubes Cylindrical, tubular structures formed by carbon atoms
- 3. A non-metal used in pencils and is a conductor of electricity
- 5. The horizontal rows on the periodic table
- 6. number of electrons present in the outermost energy shells
- 7. An element with three allotropes
- 8. A triatomic molecule, consisting of three oxygen atoms