Ohun ni Onidajo Agba fun Ile Ejo Togajulo ile Naijiria lati 30 January, 2007 titi di oni.Itokasiawon ojoibi ni 1939Awon adajo ara Naijiria.. 
In 1961, the international Union of pure and Applied Chemistry (uùc) adopted the isotope carbon-12 as the basis for Atomic Weights.. 