New chemical elements

 Dmitri Mendeleev [1834-1907]

While the world at large is preoccupied by ridiculous or uninteresting themes, I’m impressed to find that the Inorganic Chemistry Division of the IUPAC inserted officially, yesterday, four new elements into Mendeleev’s table:

          • Nihonium and symbol Nh, for the element 113,
          • Moscovium and symbol Mc, for the element 115,
          • Tennessine and symbol Ts, for the element 117, and
          • Oganesson and symbol Og, for the element 118.

When I started my studies of chemistry at Grafton High School in 1952, this table terminated down in the vicinity of neptunium, symbol Np, whose atomic number was 93. Named after the planet Neptune, it came just after uranium, symbol U, number 92, named after Uranus.

A lot of radioactive water has flowed under the bridges of inorganic chemistry since then.