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The old dogma of the tetravalency of carbon, a cornerstone of structural organic chemistry since the days of
Also since it has only one lanthanoid/cerium, which itself is usually removed due to its potential tetravalency, lanthanum is basically easy to purify.
Kekule’s conclusion dating back to the 1860’s that carbon cannot bound to more than four atoms of groups, i.e. it cannot exceed tetravalency, was refuted by discoveries obtained at the Institute.