Matches in DBpedia 2016-04 for { <http://dbpedia.org/resource/Atomic_radius> ?p ?o }
- Atomic_radius abstract "The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the center of the nucleus to the boundary of the surrounding cloud of electrons. Since the boundary is not a well-defined physical entity, there are various non-equivalent definitions of atomic radius. Three widely used definitions of atomic radius are: Van der Waals radius, ionic radius, and covalent radius.Depending on the definition, the term may apply only to isolated atoms, or also to atoms in condensed matter, covalently bound in molecules, or in ionized and excited states; and its value may be obtained through experimental measurements, or computed from theoretical models. The value of the radius may depend on the atom's state and context.Electrons do not have definite orbits, or sharply defined ranges. Rather, their positions must be described as probability distributions that taper off gradually as one moves away from the nucleus, without a sharp cutoff. Moreover, in condensed matter and molecules, the electron clouds of the atoms usually overlap to some extent, and some of the electrons may roam over a large region encompassing two or more atoms.Under most definitions the radii of isolated neutral atoms range between 30 and 300 pm (trillionths of a meter), or between 0.3 and 3 angstroms. Therefore, the radius of an atom is more than 10,000 times the radius of its nucleus (1–10 fm), and less than 1/1000 of the wavelength of visible light (400–700 nm).For many purposes, atoms can be modeled as spheres. This is only a crude approximation, but it can provide quantitative explanations and predictions for many phenomena, such as the density of liquids and solids, the diffusion of fluids through molecular sieves, the arrangement of atoms and ions in crystals, and the size and shape of molecules.Atomic radii vary in a predictable and explicable manner across the periodic table. For instance, the radii generally decrease along each period (row) of the table, from the alkali metals to the noble gases; and increase down each group (column). The radius increases sharply between the noble gas at the end of each period and the alkali metal at the beginning of the next period. These trends of the atomic radii (and of various other chemical and physical properties of the elements) can be explained by the electron shell theory of the atom; they provided important evidence for the development and confirmation of quantum theory. The atomic radii decrease across the Periodic Table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. Therefore, the effective nuclear charge towards the outermost electrons increases, drawing the outermost electrons closer. As a result, the electron cloud contracts and the atomic radius decreases.".
- Atomic_radius thumbnail Helium_atom_QM.svg?width=300.
- Atomic_radius wikiPageID "48900".
- Atomic_radius wikiPageLength "27210".
- Atomic_radius wikiPageOutDegree "372".
- Atomic_radius wikiPageRevisionID "698395743".
- Atomic_radius wikiPageWikiLink Actinide.
- Atomic_radius wikiPageWikiLink Actinium.
- Atomic_radius wikiPageWikiLink Alkali_metal.
- Atomic_radius wikiPageWikiLink Alkaline_earth_metal.
- Atomic_radius wikiPageWikiLink Aluminium.
- Atomic_radius wikiPageWikiLink Americium.
- Atomic_radius wikiPageWikiLink Antimony.
- Atomic_radius wikiPageWikiLink Argon.
- Atomic_radius wikiPageWikiLink Arsenic.
- Atomic_radius wikiPageWikiLink Astatine.
- Atomic_radius wikiPageWikiLink Atomic_nucleus.
- Atomic_radius wikiPageWikiLink Atomic_number.
- Atomic_radius wikiPageWikiLink Atomic_radii_of_the_elements_(data_page).
- Atomic_radius wikiPageWikiLink Barium.
- Atomic_radius wikiPageWikiLink Berkelium.
- Atomic_radius wikiPageWikiLink Beryllium.
- Atomic_radius wikiPageWikiLink Bismuth.
- Atomic_radius wikiPageWikiLink Bohr_model.
- Atomic_radius wikiPageWikiLink Bohr_radius.
- Atomic_radius wikiPageWikiLink Bohrium.
- Atomic_radius wikiPageWikiLink Bond_length.
- Atomic_radius wikiPageWikiLink Boron.
- Atomic_radius wikiPageWikiLink Boron_group.
- Atomic_radius wikiPageWikiLink Bromine.
- Atomic_radius wikiPageWikiLink Cadmium.
- Atomic_radius wikiPageWikiLink Caesium.
- Atomic_radius wikiPageWikiLink Calcium.
- Atomic_radius wikiPageWikiLink Californium.
- Atomic_radius wikiPageWikiLink Carbon.
- Atomic_radius wikiPageWikiLink Carbon_group.
- Atomic_radius wikiPageWikiLink Category:Atoms.
- Atomic_radius wikiPageWikiLink Category:Properties_of_chemical_elements.
- Atomic_radius wikiPageWikiLink Cerium.
- Atomic_radius wikiPageWikiLink Chalcogen.
- Atomic_radius wikiPageWikiLink Charge_radius.
- Atomic_radius wikiPageWikiLink Chemical_bond.
- Atomic_radius wikiPageWikiLink Chemical_element.
- Atomic_radius wikiPageWikiLink Chlorine.
- Atomic_radius wikiPageWikiLink Chromium.
- Atomic_radius wikiPageWikiLink Cobalt.
- Atomic_radius wikiPageWikiLink Coinage_metals.
- Atomic_radius wikiPageWikiLink Condensed_matter_physics.
- Atomic_radius wikiPageWikiLink Copernicium.
- Atomic_radius wikiPageWikiLink Copper.
- Atomic_radius wikiPageWikiLink Covalent_bond.
- Atomic_radius wikiPageWikiLink Covalent_radius.
- Atomic_radius wikiPageWikiLink Crystal.
- Atomic_radius wikiPageWikiLink Curium.
- Atomic_radius wikiPageWikiLink Darmstadtium.
- Atomic_radius wikiPageWikiLink Density.
- Atomic_radius wikiPageWikiLink Dubnium.
- Atomic_radius wikiPageWikiLink Dysprosium.
- Atomic_radius wikiPageWikiLink Einsteinium.
- Atomic_radius wikiPageWikiLink Electric_charge.
- Atomic_radius wikiPageWikiLink Electron.
- Atomic_radius wikiPageWikiLink Electron_shell.
- Atomic_radius wikiPageWikiLink Enrico_Clementi.
- Atomic_radius wikiPageWikiLink Erbium.
- Atomic_radius wikiPageWikiLink Europium.
- Atomic_radius wikiPageWikiLink Excited_state.
- Atomic_radius wikiPageWikiLink Fajans_rules.
- Atomic_radius wikiPageWikiLink Femtometre.
- Atomic_radius wikiPageWikiLink Fermium.
- Atomic_radius wikiPageWikiLink Flerovium.
- Atomic_radius wikiPageWikiLink Fluorine.
- Atomic_radius wikiPageWikiLink Francium.
- Atomic_radius wikiPageWikiLink Gadolinium.
- Atomic_radius wikiPageWikiLink Gallium.
- Atomic_radius wikiPageWikiLink Germanium.
- Atomic_radius wikiPageWikiLink Gold.
- Atomic_radius wikiPageWikiLink Group_(periodic_table).
- Atomic_radius wikiPageWikiLink Group_10_element.
- Atomic_radius wikiPageWikiLink Group_11_element.
- Atomic_radius wikiPageWikiLink Group_12_element.
- Atomic_radius wikiPageWikiLink Group_3_element.
- Atomic_radius wikiPageWikiLink Group_4_element.
- Atomic_radius wikiPageWikiLink Group_5_element.
- Atomic_radius wikiPageWikiLink Group_6_element.
- Atomic_radius wikiPageWikiLink Group_7_element.
- Atomic_radius wikiPageWikiLink Group_8_element.
- Atomic_radius wikiPageWikiLink Group_9_element.
- Atomic_radius wikiPageWikiLink Hafnium.
- Atomic_radius wikiPageWikiLink Halogen.
- Atomic_radius wikiPageWikiLink Hassium.
- Atomic_radius wikiPageWikiLink Helium.
- Atomic_radius wikiPageWikiLink Holmium.
- Atomic_radius wikiPageWikiLink Hydrogen.
- Atomic_radius wikiPageWikiLink Indium.
- Atomic_radius wikiPageWikiLink Inert_pair_effect.
- Atomic_radius wikiPageWikiLink Iodine.
- Atomic_radius wikiPageWikiLink Ionic_bonding.
- Atomic_radius wikiPageWikiLink Ionic_radius.
- Atomic_radius wikiPageWikiLink Ionization.
- Atomic_radius wikiPageWikiLink Iridium.