he failed to recognise the presence of the lanthanides in the sixth row.

In 1902, Bohuslav Brauner placed lanthanides in a special series instead of Mendeleev's extra period, so he renamed Mendeleev's tri-manganese as dvi-manganese and dvi-tellurium as eka-tellurium (polonium had already been discovered, but its chemical properties had not yet been studied). Dvi-caesium was renamed eka-caesium.

Later predictions

In 1902, having accepted the evidence for elements helium

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