Describe one physical or chemical property of boron

The melting point of boron is 2079°C, its boiling/sublimation point is at 2550°C, the specific gravity of crystalline boron is 2.34, the specific gravity of the amorphous form is 2.37, and its valence is 3. Boron has interesting optical properties. Boron filaments have high strength, yet are lightweight.

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the answer is d. 4

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