Boron11 - 5 protons, 6 neutrons; 1s22s22p1 electronic configuration; 19.5 ppm cosmic abundance relative to silicon; <0.05 barns neutron capture cross section; 81.2% of all boron; fundamental form = icosahedra / rhombohedral crystals; melting point = 2076oC; chemistry far more complex and varied than carbon; classified as a metalloid; p-type dopant; makes diamonds blue; grain boundary strengthener in some alloys; essential in cell protein synthesis
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