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[[File:A_New_System_of_Chemical_Philosophy_fp.jpg|A New System of Chemical Philosophy fp|thumb]] [[File:Geiger-Marsden_experiment_expectation_and_result.svg|Geiger-Marsden experiment expectation and result|thumb|left]] [[File:Bohr_atom_animation_2.gif|Bohr atom animation 2|thumb|left]] [[File:S-p-Orbitals.svg|S-p-Orbitals|thumb]] [[File:Binding_energy_curve_-_common_isotopes.svg|Binding energy curve - common isotopes|thumb]] '''Atom''' is the fundamental building block of all [[matter]]. It is the smallest unit of an [[element]] that retains the chemical properties of that element. Atoms consist of a nucleus made of [[protons]] and [[neutrons]], with [[electrons]] orbiting this nucleus. The study of atoms and their properties is a key part of [[chemistry]] and [[physics]], providing the foundation for understanding the composition, structure, and reactions of all material substances.

==Structure==
The structure of an atom is characterized by its nucleus, which contains positively charged protons and neutrally charged neutrons, and the electron cloud that surrounds the nucleus. Electrons, which are negatively charged, orbit the nucleus at various energy levels or electron shells. The number of protons in the nucleus determines the atomic number of an element, which in turn defines the element's chemical properties. The total number of protons and neutrons in an atom's nucleus defines its atomic mass.

==Behavior==
Atoms can engage in various interactions, including chemical bonds to form [[molecules]] and compounds. The type of chemical bond (covalent, ionic, metallic, etc.) depends on the elements involved and their electron configurations. Atoms can gain or lose electrons, becoming ions (positively or negatively charged atoms) in the process. The behavior of atoms and their ability to form bonds is the basis for all chemical reactions.

==History==
The concept of the atom has evolved over centuries. Early philosophers like Democritus proposed the idea of indivisible particles as the building blocks of matter. However, it wasn't until the 19th century that scientists such as John Dalton developed the modern atomic theory, which provided a scientific basis for the concept of atoms. Subsequent discoveries, including the electron by J.J. Thomson, the nucleus by Ernest Rutherford, and the quantum mechanical model of the atom by Niels Bohr and others, have refined our understanding of atomic structure.

==Quantum Mechanics==
The behavior of electrons in atoms is governed by the principles of [[quantum mechanics]], a branch of physics that describes the behavior of particles at the atomic and subatomic levels. Quantum mechanics introduces the concept of wave-particle duality, where electrons exhibit both particle-like and wave-like properties. The exact position of an electron in an atom cannot be determined; instead, quantum mechanics provides probabilities of finding an electron in certain regions around the nucleus.

==Applications==
Understanding atoms and their interactions is crucial for numerous scientific and technological fields. In [[chemistry]], it enables the synthesis of new materials and compounds. In [[physics]], the study of atomic and subatomic particles has led to the development of technologies such as nuclear energy and semiconductors. In [[biology]], the understanding of atomic interactions is fundamental to the study of life at the molecular level.

==See Also==
* [[Molecule]]
* [[Element]]
* [[Chemical reaction]]
* [[Quantum mechanics]]
* [[Periodic table]]

[[Category:Physics]]
[[Category:Chemistry]]
[[Category:Atomic physics]]

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Atom - Revision history

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