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{{Short description|Central part of an atom containing protons and neutrons}}
{{Short description|Central part of an atom containing protons and neutrons}}


[[Book:Quantum Collection/Matter (by scale)|← Back to Matter by scale]]
{{Quantum matter backlink|Atoms}}


The '''atomic nucleus''' is the central region of an [[Physics:Quantum atoms/atom|atom]], composed of [[Physics:Quantum particles/proton|protons]] and [[Physics:Quantum particles/neutron|neutrons]]. It contains nearly all of the atom’s mass.
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An atom is a Book II topic in the Quantum Collection. An atom is a bound quantum system consisting of a compact nucleus surrounded by electrons occupying quantized states. Atomic structure is governed by the Coulomb interaction, the Pauli exclusion principle, spin, angular momentum, and the allowed solutions of the quantum wave equation. The discreteness of atomic energy levels explains spectral lines, chemical periodicity, ionization, and many precision tests of quantum theory. In the Quantum Collection, atoms provide the bridge between elementary particles, nuclear matter, molecular bonding, spectroscopy, and controllable quantum systems.
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[[File:Quantum_atoms_atom_concept_map.svg|thumb|280px|atom in the Quantum Collection.]]
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<div style="font-size:90%;">Representation of the atomic nucleus composed of protons and neutrons.</div>
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Latest revision as of 23:54, 23 May 2026


← Back to Atoms Book II

An atom is a Book II topic in the Quantum Collection. An atom is a bound quantum system consisting of a compact nucleus surrounded by electrons occupying quantized states. Atomic structure is governed by the Coulomb interaction, the Pauli exclusion principle, spin, angular momentum, and the allowed solutions of the quantum wave equation. The discreteness of atomic energy levels explains spectral lines, chemical periodicity, ionization, and many precision tests of quantum theory. In the Quantum Collection, atoms provide the bridge between elementary particles, nuclear matter, molecular bonding, spectroscopy, and controllable quantum systems.

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atom in the Quantum Collection.

Description

The nucleus is bound together by the strong nuclear force and is much smaller than the overall size of the atom. Electrons occupy regions outside the nucleus in quantum states.

Properties

  • nuclear charge
  • mass number
  • binding energy

See also

Table of contents (217 articles)

Index

Full contents

References


Author: Harold Foppele


Source attribution: Physics:Quantum atoms/nucleus

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