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- Extended_periodic_table abstract "An extended periodic table theorizes about elements beyond element 118 (beyond period 7, or row 7). Currently seven periods in the periodic table of chemical elements are known and proven, culminating with atomic number 118. If further elements with higher atomic numbers than this are discovered, they will be placed in additional periods, laid out (as with the existing periods) to illustrate periodically recurring trends in the properties of the elements concerned. Any additional periods are expected to contain a larger number of elements than the seventh period, as they are calculated to have an additional so-called g-block, containing at least 18 elements with partially filled g-orbitals in each period. An eight-period table containing this block was suggested by Glenn T. Seaborg in 1969. IUPAC defines an element to exist if its lifetime is longer than 10−14 seconds, which is the time it takes for the nucleus to form an electronic cloud.No elements in this region have been synthesized or discovered in nature. The first element of the g-block may have atomic number 121, and thus would have the systematic name unbiunium. Elements in this region are likely to be highly unstable with respect to radioactive decay, and have extremely short half lives, although element 126 is hypothesized to be within an island of stability that is resistant to fission but not to alpha decay. It is not clear how many elements beyond the expected island of stability are physically possible, if period 8 is complete, or if there is a period 9.According to the orbital approximation in quantum mechanical descriptions of atomic structure, the g-block would correspond to elements with partially filled g-orbitals, but spin-orbit coupling effects reduce the validity of the orbital approximation substantially for elements of high atomic number. While Seaborg's version of the extended period had the heavier elements following the pattern set by lighter elements, as it did not take into account relativistic effects, models that take relativistic effects into account do not. Pekka Pyykkö and B. Fricke used computer modeling to calculate the positions of elements up to Z = 184 (comprising periods 8, 9, and the beginning of 10), and found that several were displaced from the Madelung rule.".
- Extended_periodic_table wikiPageExternalLink jeries.rihani.com.
- Extended_periodic_table wikiPageExternalLink www.ericscerri.com.
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- Extended_periodic_table wikiPageWikiLink Actinide.
- Extended_periodic_table wikiPageWikiLink Actinium.
- Extended_periodic_table wikiPageWikiLink Ahrlands_softness_parameter.
- Extended_periodic_table wikiPageWikiLink Alkali_metal.
- Extended_periodic_table wikiPageWikiLink Alkali_metals.
- Extended_periodic_table wikiPageWikiLink Alkaline_earth_metal.
- Extended_periodic_table wikiPageWikiLink Alpha_decay.
- Extended_periodic_table wikiPageWikiLink Alpha_particle.
- Extended_periodic_table wikiPageWikiLink Amnon_Marinov.
- Extended_periodic_table wikiPageWikiLink Aqueous_solution.
- Extended_periodic_table wikiPageWikiLink Atomic_mass_unit.
- Extended_periodic_table wikiPageWikiLink Atomic_number.
- Extended_periodic_table wikiPageWikiLink Atomic_orbital.
- Extended_periodic_table wikiPageWikiLink Atomic_radius.
- Extended_periodic_table wikiPageWikiLink Aufbau_principle.
- Extended_periodic_table wikiPageWikiLink Barium.
- Extended_periodic_table wikiPageWikiLink Barn_(unit).
- Extended_periodic_table wikiPageWikiLink Berkelium.
- Extended_periodic_table wikiPageWikiLink Block_(periodic_table).
- Extended_periodic_table wikiPageWikiLink Bohr_model.
- Extended_periodic_table wikiPageWikiLink Boiling_point.
- Extended_periodic_table wikiPageWikiLink Boron_group.
- Extended_periodic_table wikiPageWikiLink CERN.
- Extended_periodic_table wikiPageWikiLink Caesium.
- Extended_periodic_table wikiPageWikiLink Calcium.
- Extended_periodic_table wikiPageWikiLink Carbon_group.
- Extended_periodic_table wikiPageWikiLink Carbonyl.
- Extended_periodic_table wikiPageWikiLink Category:Hypothetical_chemical_elements.
- Extended_periodic_table wikiPageWikiLink Category:Periodic_table.
- Extended_periodic_table wikiPageWikiLink Celsius.
- Extended_periodic_table wikiPageWikiLink Cerium.
- Extended_periodic_table wikiPageWikiLink Chalcogen.
- Extended_periodic_table wikiPageWikiLink Chemical_element.
- Extended_periodic_table wikiPageWikiLink Chemical_elements.
- Extended_periodic_table wikiPageWikiLink Chemical_series.
- Extended_periodic_table wikiPageWikiLink Cohesive_energy.
- Extended_periodic_table wikiPageWikiLink Congener_(chemistry).
- Extended_periodic_table wikiPageWikiLink Covalent_bond.
- Extended_periodic_table wikiPageWikiLink Covalent_radius.
- Extended_periodic_table wikiPageWikiLink Cyanide.
- Extended_periodic_table wikiPageWikiLink Darmstadt.
- Extended_periodic_table wikiPageWikiLink Degree_Celsius.
- Extended_periodic_table wikiPageWikiLink Density.
- Extended_periodic_table wikiPageWikiLink Diatomic_nonmetal.
- Extended_periodic_table wikiPageWikiLink Dirac_equation.
- Extended_periodic_table wikiPageWikiLink Dubna.
- Extended_periodic_table wikiPageWikiLink Eigenvalue.
- Extended_periodic_table wikiPageWikiLink Eigenvalues_and_eigenvectors.
- Extended_periodic_table wikiPageWikiLink Einsteinium.
- Extended_periodic_table wikiPageWikiLink Eka-superactinide.
- Extended_periodic_table wikiPageWikiLink Electron_configuration.
- Extended_periodic_table wikiPageWikiLink Electronvolt.
- Extended_periodic_table wikiPageWikiLink Enthalpy.
- Extended_periodic_table wikiPageWikiLink Erbium.
- Extended_periodic_table wikiPageWikiLink Extended_periodic_table.
- Extended_periodic_table wikiPageWikiLink Fine-structure_constant.
- Extended_periodic_table wikiPageWikiLink Fine_structure_constant.
- Extended_periodic_table wikiPageWikiLink Flerovium.
- Extended_periodic_table wikiPageWikiLink Fluoride.
- Extended_periodic_table wikiPageWikiLink Fluorine.
- Extended_periodic_table wikiPageWikiLink Francium.
- Extended_periodic_table wikiPageWikiLink GSI_Helmholtz_Centre_for_Heavy_Ion_Research.
- Extended_periodic_table wikiPageWikiLink Georgy_Flerov.
- Extended_periodic_table wikiPageWikiLink Georgy_Flyorov.
- Extended_periodic_table wikiPageWikiLink Gesellschaft_für_Schwerionenforschung.
- Extended_periodic_table wikiPageWikiLink Glenn_T._Seaborg.
- Extended_periodic_table wikiPageWikiLink Group_(periodic_table).
- Extended_periodic_table wikiPageWikiLink Group_10_element.
- Extended_periodic_table wikiPageWikiLink Group_11_element.
- Extended_periodic_table wikiPageWikiLink Group_12_element.
- Extended_periodic_table wikiPageWikiLink Group_3_element.
- Extended_periodic_table wikiPageWikiLink Group_4_element.
- Extended_periodic_table wikiPageWikiLink Group_5_element.
- Extended_periodic_table wikiPageWikiLink Group_6_element.
- Extended_periodic_table wikiPageWikiLink Group_7_element.
- Extended_periodic_table wikiPageWikiLink Group_8_element.
- Extended_periodic_table wikiPageWikiLink Group_9_element.
- Extended_periodic_table wikiPageWikiLink HSAB.
- Extended_periodic_table wikiPageWikiLink HSAB_theory.
- Extended_periodic_table wikiPageWikiLink Half-life.
- Extended_periodic_table wikiPageWikiLink Half_life.
- Extended_periodic_table wikiPageWikiLink Halogen.
- Extended_periodic_table wikiPageWikiLink Hardness.
- Extended_periodic_table wikiPageWikiLink Hartree–Fock_method.
- Extended_periodic_table wikiPageWikiLink Hassium.
- Extended_periodic_table wikiPageWikiLink Hebrew_University_of_Jerusalem.
- Extended_periodic_table wikiPageWikiLink Homology_(chemistry).
- Extended_periodic_table wikiPageWikiLink Hyperdeformation.
- Extended_periodic_table wikiPageWikiLink Hypernucleus.
- Extended_periodic_table wikiPageWikiLink IUPAC.
- Extended_periodic_table wikiPageWikiLink Inert_pair_effect.
- Extended_periodic_table wikiPageWikiLink International_Union_of_Pure_and_Applied_Chemistry.
- Extended_periodic_table wikiPageWikiLink Iodide.