The central system of protons and neutrons in an atom. Its mass number is its baryon number in ordinary nuclear states; is the proton number and the neutron number.
The atomic nucleus is the small, dense region at the center of an atom that contains most of the atom's mass. It is composed of two types of subatomic particles: protons and neutrons. - **Protons** are positively charged particles, and their number determines the atomic number of an element, which defines the element itself (e.g., hydrogen has one proton, while carbon has six). - **Neutrons** are neutral particles, meaning they have no charge.
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