A naming ceremony for the chemical element nihonium takes place in Tokyo, with then Crown Prince Naruhito in attendance.

Nihonium is a synthetic chemical element; it has symbol Nh and atomic number 113. It is extremely radioactive: its most stable known isotope, nihonium-286, has a half-life of about 10 seconds. In the periodic table, nihonium is a transactinide element in the p-block. It is a member of period 7 and group 13.

Naruhito is the Emperor of Japan. He acceded to the Chrysanthemum Throne following the abdication of his father, Akihito, on 1 May 2019, beginning the Reiwa era. He is the 126th monarch, according to the traditional order of succession.

March 14 is the 73rd day of the year in the Gregorian calendar; 292 days remain until the end of the year.