This was very accurate and precise and, in places where there were exceptions, allowed for him to predict where new elements would be placed and their relative atomic mass, to a great degree of accuracy (1 jan 1869 ano – 23 h 59 m, 31 dez 1869 ano)
Adicionado na linha do tempo:
Data:
1 jan 1869 ano
23 h 59 m, 31 dez 1869 ano
~ 12 months