Boron
Boron is a chemical element with atomic number 5 and the chemical symbol B. Boron is a trivalent nonmetallic element which occurs abundantly in the evaporite ores borax and ulexite. Boron is never found as a free element in nature.
Several allotropes of boron exist; amorphous boron is a brown powder, though crystalline boron is black, hard (9.3 on Mohs' scale), and a weak conductor at room temperature. Elemental boron is used as a dopant in the semiconductor industry, while boron compounds play important roles as light structural materials, nontoxic insecticides and preservatives, and reagents for chemical synthesis.
| General | |
|---|---|
| Atomic number: | 5 |
| Symbol: | B |
| Atomic weight: | 10.811 |
| Boiling Point (C): | -- |
| Melting Point (C): | 2030 |
| Density: | 2.34 |
| heatVapor: | 128 |
| heatFusion: | 5.3 |
| Electrical Conductivity: | 1e-12 |
| Thermal Conductivity: | -- |
| Specific Heat Capacity: | .309 |
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