Countless periodic table posters are now obsolete
Countless periodic table posters are now obsolete. Meet the elements nihonium (Nh), moscovium (Mc), tennessine (Ts) and oganesson (Og). On November 28, the International Union of Pure and Applied Chemistry gave its seal of approval to the names proposed for the four elements, which take slots 113, 115, 117 and 118 on the periodic table. Unwieldy placeholder names — ununtrium, ununpentium, ununseptium and ununoctium, assigned when the elements were added to the table in December 2015 — can now be scrubbed.