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It was van den Broek who first in 1913 suggested that the charge in the
atomic nucleus expressed in elementary charge units (e) is equal to the
atomic number Z. The atomic number Z was originally introduced as a serial
increasing number assigned to the known elements when these are sorted
Atoms: Rutherford
´
s Atom Model
according to increasing atomic weight (the periodic table of elements
proposed by Dmitrij Iwanowitsch Mendelejew (1834-1907) in 1869).
The definitive interpretation of Z was achieved by Henry Moseley (1887-
1915).