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- Atom abstract "The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force. Likewise, a group of atoms can remain bound to each other by chemical bonds based on the same force, forming a molecule. An atom containing an equal number of protons and electrons is electrically neutral, otherwise it is positively or negatively charged and is known as an ion. An atom is classified according to the number of protons and neutrons in its nucleus: the number of protons determines the chemical element, and the number of neutrons determines the isotope of the element.Chemical atoms, which in science now carry the simple name of "atom," are minuscule objects with diameters of a few tenths of a nanometer and tiny masses proportional to the volume implied by these dimensions. Atoms can only be observed individually using special instruments such as the scanning tunneling microscope. Over 99.94% of an atom's mass is concentrated in the nucleus, with protons and neutrons having roughly equal mass. Each element has at least one isotope with an unstable nucleus that can undergo radioactive decay. This can result in a transmutation that changes the number of protons or neutrons in a nucleus. Electrons that are bound to atoms possess a set of stable energy levels, or orbitals, and can undergo transitions between them by absorbing or emitting photons that match the energy differences between the levels. The electrons determine the chemical properties of an element, and strongly influence an atom's magnetic properties. The principles of quantum mechanics have been successfully used to model the observed properties of the atom.".
- Atom wikiPageExternalLink ?id=pheL_ubbXD0C&dq.
- Atom wikiPageExternalLink books?id=FJMEAAAAYAAJ.
- Atom wikiPageExternalLink pt_ar5.html.
- Atom wikiPageExternalLink atomic_size.htm.
- Atom wikiPageExternalLink Atom.
- Atom wikiPageExternalLink 01233976.pdf?arnumber=1233976.
- Atom wikiPageExternalLink A6672963.
- Atom wikiPageExternalLink index.pl?Type=TOC.
- Atom wikiPageExternalLink www.hbcpnetbase.com.
- Atom wikiPageExternalLink atom.htm.
- Atom wikiPageExternalLink einleitung_hauptseite_uk.html.
- Atom wikiPageExternalLink atom.html.
- Atom wikiPageID "902".
- Atom wikiPageRevisionID "606469168".
- Atom colwidth "30".
- Atom group ""note"".
- Atom hasPhotoCollection Atom.
- Atom n "no".
- Atom q "no".
- Atom s "The New Student's Reference Work".
- Atom v "The Atom".
- Atom voy "no".
- Atom wikt "atom".
- Atom subject Category:Atoms.
- Atom subject Category:Chemistry.
- Atom subject Category:Concepts_in_physics.
- Atom comment "The atom is a basic unit of matter that consists of a dense central nucleus surrounded by a cloud of negatively charged electrons. The atomic nucleus contains a mix of positively charged protons and electrically neutral neutrons (except in the case of hydrogen-1, which is the only stable nuclide with no neutrons). The electrons of an atom are bound to the nucleus by the electromagnetic force.".
- Atom label "Atom".
- Atom label "Atom".
- Atom label "Atom".
- Atom label "Atome".
- Atom label "Atomo".
- Atom label "Atoom".
- Atom label "Átomo".
- Atom label "Átomo".
- Atom label "Атом".
- Atom label "ذرة".
- Atom label "原子".
- Atom label "原子".
- Atom sameAs Atom.
- Atom sameAs Atom.
- Atom sameAs Άτομο.
- Atom sameAs Átomo.
- Atom sameAs Atomo.
- Atom sameAs Atome.
- Atom sameAs Atom.
- Atom sameAs Atomo.
- Atom sameAs 原子.
- Atom sameAs 원자.
- Atom sameAs Atoom.
- Atom sameAs Atom.
- Atom sameAs Átomo.
- Atom sameAs m.0ktl.
- Atom sameAs Q9121.
- Atom sameAs Q9121.
- Atom wasDerivedFrom Atom?oldid=606469168.
- Atom isPrimaryTopicOf Atom.