| Symbol | Si |
| Atomic No | 14 |
| Atomic weight | 28.086 |
| Atomic density at 20°C, cm-3 | 5.00 x 10²² |
| Atomic volume at 20°C, cm3/g-atom | 12.057 |
| Lattice parameter at 23°C, A | 5.43089 ± 0.00016 |
| Crystal structure | Diamond cubic |
| Density at 25°C, g/cm3 | 2.329 |
| Hardness, mohs scale | 7 |
| Melting point °C | 1412 |
| Boiling point °C | 2878 |
| Heat of sublimation at m.p kcal/g | 4.075 |
| Heat of vaporization at m.p, kcal/g | 3.812 |
| Vapor pressure at m.p, mmHg | 2.8 x 10-3 |
| Heat of fusion at m.p, cal/g | 264 |
| Solid heat capacity at 25°C, cal/(moleK) | 4.78 |
| Liquid heat capacity at m.p, cal/(moleK) | 6.755 |
| Liquid density at m.p, gm/cm3 | 2.533 |
| Surface tension at m.p, dynes/cm | 736 |
| Liquid viscosity at m.p, centipoises | 0.88 |
| Linear thermal expansion coefficient at 25°C,K-1 | 2.55 x 10-6 |
| dN/dT | 1.50 x 10-4 K-1 |
