Molecular Structure.
Atoms, electrons, neutrons and protons

Atomic nucleus definition

The atomic nucleus is the central part of the atom small, positively charged and which concentrates most of the mass of the atom.

The main subatomic particles from the nuclei of atoms are protons and neutrons, or nucleons (except ordinary hydrogen or protium, which contains only one proton ). The same chemical element is characterized by the number of protons in the nucleus determines the overall positive charge. This number is called the atomic number. The mass number is the total number of protons and neutrons.

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Last review: February 1, 2016