Boron Reactor
The remarkable materials of an electron-poor atom
Summary
Boron is a small metalloid with only three outer electrons. This "shortage" makes it one of the most inventive elements in chemistry: boron carbide, nearly as hard as diamond; boron nitride, as slippery as graphite; boranes that catch fire on their own in air; heat-resistant glass and the bleaches in detergents all come from boron. In the reactor you can build 23 boron substances from boron, hydrogen, oxygen, nitrogen, carbon and sodium atoms and see the properties of each. About three-quarters of the world's boron reserves are in Türkiye.
In depth
Boron sits to the left of carbon in the periodic table and has 3 electrons in its outer shell. When it forms three bonds it has six electrons around it instead of eight, leaving one orbital empty. Boron fills this gap in three ways: by taking a neighbour's electron pair (a dative bond, H₃N–BH₃), by sharing two electrons among three atoms (the 3-centre 2-electron "banana bond", B₂H₆) or by becoming a negatively charged ion (BH₄⁻). This flexibility makes possible icosahedral cages (B₁₂, carboranes), boron-nitrogen twins of carbon structures (borazine ↔ benzene, h-BN ↔ graphite) and materials that approach diamond in hardness (B₄C). The lab does the bond bookkeeping for the atoms you drop in, and separately flags cases such as the boranes where classical bond counting is not enough.
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