,in 1860.

    Because cs for so long ion, conventions o emerge. Untilo tury, t mean er to one cbut o anot ed everywhere.

    Cs also used a bey of symbols and abbreviations, often self-invented.

    Sters by decreeing tts be abbreviated on tin names, in ferrum ) and t for silver is Ag (from tinargentum ). t so many of tions accord rogen, O for Oxygen, s Englisinate nature, not itsexalted status. to indicate toms in a molecule, Berzelius employed asuperscript notation, as in er, for no special reason, to render t: h2O.

    Despite tidyings-up, cry by teenturyoprominence in 1869 of an odd and crazed-looking professor at ty of St. Petersburgnamed Dmitri Ivanovich Mendeleyev.

    Mendeleyev (also sometimes spelled Mendeleev or Mendeléef) tobolsk, in t of Siberia, into a ed, reasonably prosperous, and verylarge family—so large, in fact, t ory  track of exactly een ceen. All agree, atany rate, t Dmitri . Luck  alri  to raordinary ory. All  il 1848, o penury. Determined to get  cion, table Mrs. Mendeleyev cri four to St.

    Petersburg—t’s equivalent to traveling from London to Equatorial Guinea—and deposited titute of Pedagogy. orn out by s, ser.

    Mendeleyev dutifully completed udies and eventually landed a position at ty. tent but not terribly outstanding c, kno once a year, ts in tory.

    ty-five, o toy o arrange ts. At time, elements omic ance). Mendeleyev’s breakto see t table.

    As is often tually been anticipated teur c in England named Joed t