Answer» | No. | Crystal system | Type | Edge length | Angle | Examples | | 1. | Cubic | Simple/primitive | a = b = c | \(\alpha=\beta=\gamma=90^\circ\) | Polonium | | 2 | Cubic | Body centred | a = b = c | \(\alpha=\beta=\gamma=90^\circ\) | Fe, Rb, Na, Ti, W, U, Zr | | 3. | Cubic | Face centred | a = b = c | \(\alpha=\beta=\gamma=90^\circ\) | Cu, Al, Ni, Au, Ag, Pt | | 4. | Tetragonal | Primitive | a = b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | SnO2 | | 5. | Tetragonal | Body centred | a = b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | TiO2, CaSO4 | | 6. | Orthorhombic | Primitive | a ≠ b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | Rhombic sulphur | | 7. | Orthorhombic | Body centred | a ≠ b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | KNO3 | | 8. | Orthorhombic | Face centred | a ≠ b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | BaSO4 | | 9. | Orthorhombic | End centred | a ≠ b ≠ c | \(\alpha=\beta=\gamma=90^\circ\) | MgSO4. 7H2O | | 10. | Monoclinic | Primitive | a ≠ b ≠ c | \(\alpha=\beta=90^\circ,\,\gamma\neq90^\circ\) | Monoclinic sulphur | | 11. | Monoclinic | End centred | a ≠ b ≠ c | \(\alpha=\beta=90^\circ,\,\gamma\neq90^\circ\) | Na2SO4. 10H2O | | 12. | Triclinic | Primitive | a ≠ b ≠ c | \(\alpha\neq\beta\neq\gamma\neq90^\circ\) | K2Cr2O7, H3BO3 | | 13. | Hexagonal | Primitive | a = b ≠c | \(\alpha=\beta=90^\circ,\,\gamma=120^\circ\) | ZnO, BeO, CoS, SnS | | 14. | Rhombohedral | Primitive | a = b = c | \(\alpha=\beta=\gamma\neq90^\circ\) | Calcite, NaNO3, FeCO3 |
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