They all have a link to the periodic table, which turned 150 in 2019 ... in order to make it black. It all went downhill from there for the poor element. In Medieval times, it was used medicinally ...
The zigzag, staircase, line in the diagram of the periodic table above separates the metals, on the left, from non-metals, on the right. Hydrogen is a non-metal, but it is often put in the middle.
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