The atomic nucleus is the small, dense region consisting of protons and neutrons at the center of an atom, discovered in 1911 by Ernest Rutherford based...

The atomic number or nuclear charge number (symbol Z) of a chemical element is the charge number of an atomic nucleus. For ordinary nuclei composed of...

are attracted to the protons in an atomic nucleus by the electromagnetic force. The protons and neutrons in the nucleus are attracted to each other by the...

The shape of the atomic nucleus been depicted as a compact bundle of the two types of nucleons that look like little balls stuck together, protons (red)...

Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. Atomic physics typically refers to...

nucleons) in an atomic nucleus. It is approximately equal to the atomic (also known as isotopic) mass of the atom expressed in atomic mass units. Since...

rules for the ordering of the nucleus shells are similar to Hund's Rules of the atomic shells, however, unlike its use in atomic physics, the completion of...

behave similarly within the nucleus, they are both referred to as nucleons. Nucleons have a mass of approximately one atomic mass unit, or dalton (symbol:...

up nucleus in Wiktionary, the free dictionary. Nucleus (pl.: nuclei) is a Latin word for the seed inside a fruit. It most often refers to: Atomic nucleus...

hydrogen atom, and the atomic number had been identified as the charge on the nucleus.: §1.1.2  Throughout the 1920s, the nucleus was viewed as composed...

that the charge of an atomic nucleus, expressed as a multiplier of hydrogen's nuclear charge (e), is roughly half the atom's atomic weight, based on how...

the Bethe–Weizsäcker process) is used to approximate the mass of an atomic nucleus from its number of protons and neutrons. As the name suggests, it is...

containing most of the atom's mass; this region would be known as the atomic nucleus. The Rutherford model was subsequently superseded by the Bohr model...

the structure of the atomic nucleus is one of the central challenges in nuclear physics. The cluster model describes the nucleus as a molecule-like collection...

of atom which has a specific number of protons in its atomic nucleus (i.e., a specific atomic number, or Z). The definitive visualisation of all 118...

The atomic radius of a chemical element is a measure of the size of its atom, usually the mean or typical distance from the center of the nucleus to the...

possibility of atomic energy. H. G. Wells popularized the phrase "splitting the atom",[citation needed] before discovery of the atomic nucleus. Atomic energy...

an atomic nucleus, e.g. a helium-4 nucleus is composed of two protons and two neutrons. Most hadrons do not live long enough to bind into nucleus-like...

the 6 3Li nucleus has a standard atomic weight of 6.015 atomic mass units (abbreviated u), the deuterium has 2.014 u, and the helium-4 nucleus has 4.0026...

is used to predict the configuration of protons and neutrons in an atomic nucleus. In neutral atoms, the approximate order in which subshells are filled...

the element's atomic number. For example, oxygen has an atomic number of 8, meaning that each oxygen atom has 8 protons in its nucleus. Two or more atoms...

decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or "decays" into a different atomic nucleus, with a mass number...

of the electron in 1897, but before Ernest Rutherford discovered the atomic nucleus in 1911. The model tried to account for two properties of atoms then...

such that they are arranged into complete shells within the atomic nucleus. As a result, atomic nuclei with a "magic" number of protons or neutrons are much...

physics, beta decay (β-decay) is a type of radioactive decay in which an atomic nucleus emits a beta particle (fast energetic electron or positron), transforming...

"atmosphere" (the electron), distributed around a relatively tiny planet (the nucleus). Atomic orbitals exactly describe the shape of this "atmosphere" only when...

atom became clearer with Ernest Rutherford's 1911 discovery that of an atomic nucleus surrounded by electrons in which he quoted Nagaoka rejected Thomson's...

high-speed electron or positron emitted by the radioactive decay of an atomic nucleus during the process of beta decay. There are two forms of beta decay...

disintegration, or nuclear disintegration) is the process by which an unstable atomic nucleus loses energy by radiation. A material containing unstable nuclei is...

In nuclear physics, an atomic nucleus is called a halo nucleus or is said to have a nuclear halo when it has a core nucleus surrounded by a "halo" of orbiting...