Boron B

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Boron B, not to be confused with Bohrium, is a chemical element and semiconductor with atomic number 5. It is thus one of the simplest of atmos (hydrogen, helium, lithium and beryllium are the only ones even simpler) and closely related to Silicon Si.

Boron is a metal known for its exceptional resistance and form: even if it is very light as a filament, it has a triple resistance and a double form in comparison to steel. 

Boron as a material itself is relatively nontoxic to humans as well as mammals. Boron hydrogen compounds however are quite poisonous.