When was the whole number rule enunciated?
After the Discovery of Isotopes
Before the Discovery of Gravity
During the Renaissance
In the Early 20th Century
Answer
The whole number rule states that the atomic number of an element is equal to the number of protons in its nucleus. This rule was enunciated after the discovery of isotopes, which are atoms of the same element with different numbers of neutrons. Isotopes were discovered in 1913 by Ernest Rutherford, who found that the mass of an atom is not necessarily equal to its atomic number.
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