Molecular Structure.
Atoms, electrons, neutrons and protons

Atomic number definition

The atomic number is the number of elementary positive charges, or protons, that carry the nuclei of all the isotopes of a given element.

At first, the atomic number was the order that was given to an item when ordered in ascending order according to their atomic masses.

In 1913, Johannes H. van den Broek, analyzing all known information, found that the number of elementary charges of the atomic nucleus was equal to the atomic number. Later, Niels Bohr adopted this discovery to develop its structure quantum theory of atoms and the source of the spectra.

Currently, Z is a known nuclear amount without any error to all cores. However, the effective charge Ze is known experimental errors with their corresponding physical quantity as a whole.

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Last review: February 1, 2016