VOICEOVER: Chemical symbols and formulas. Every element in the periodic table is represented by a unique chemical symbol, like O for Oxygen or Mg for Magnesium.Chemical formulas represent ...

150 years ago, Russian chemist Dmitrii Mendeleev created the periodic table of the elements, revolutionizing chemistry. Skip to content. Subscribe or renew today ...

Promethium is the most elusive member of the lanthanide family, a row of 15 metals marooned in the periodic table’s southern territories. Discovered in 1945, ...