Boron
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Boron is a chemical element; it has symbol B and atomic number 5. In its crystalline form it is a brittle, dark, lustrous metalloid; in its amorphous form it is a brown powder. As the lightest element
boron (β-rhombohedral)
Amorphous boron powder
Sassolite
Boron chunks
Carbon
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Carbon is a chemical element; it has symbol C and atomic number 6. It is nonmetallic and tetravalent—meaning that its atoms are able to form up to four covalent bonds due to its valence shell exhibiti
Boron
…crystallinity, particle size, purity and temperature. At higher temperatures boron burns to form boron trioxide: In some ways, boron is comparable to carbon in its capability to form stable covalently bonded molecular networks (even nominally disordered (amorphous) boron contains boron icosahedra, which are…
Graphite (left) and diamond (right), two allotropes of carbon
Comet C/2014 Q2 (Lovejoy) surrounded by glowing carbon vapor
A large sample of glassy carbon
Graphite ore, shown with a penny for scale