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By Anne Marie Helmenstine, Ph.D.
This is a photo of pure crystalline boron. Boron is a lustrous, black semimetal. Boron is not found free in nature, though it is found in many common compounds.
Definition: Boron is the name for the element with atomic number 5 and is represented by the symbol B.
It is a member of the semimetal group.
Anne Marie Helmenstine, Ph.D.
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