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- D-block_contraction abstract "d-block contraction (sometimes called scandide contraction) is a term used in chemistry to describe the effect of having full d orbitals on the period 4 elements. The elements in question are Ga, Ge, As, Se and Br. Their electronic configurations include completely filled d orbitals (d10). d-block contraction is best illustrated by comparing some properties of the group 13 elements to highlight the effect on gallium.Gallium can be seen to be anomalous. The most obvious effect is that the sum of the first three ionization potentials of gallium is higher than that of aluminium, whereas the trend in the group would be for it to be lower. The second table below shows the trend in the sum of the first three ionization potentials for the elements B, Al, Sc, Y, La. Sc, Y, La are group 3 elements and have three valence electrons above a noble gas electron core. In contrast to the group 13 elements this sequence shows a smooth reduction.Other effects of the d-block contraction are that the Ga3+ ion is smaller than expected, being closer in size to Al3+. Care must be taken in interpreting the ionization potentials for indium and thallium, other effects e.g. the inert pair effect become increasingly important for the heavier members of the group.The cause of the d-block contraction is the poor shielding of the nuclear charge by the electrons in the d orbitals. The outer valence electrons are more strongly attracted by the nucleus causing the observed increase in ionization potentials. The d-block contraction can be compared to the lanthanide contraction which is caused by inadequate shielding of nuclear charge by electrons occupying f orbitals.".
- D-block_contraction thumbnail D-block_contraction--EN.png?width=300.
- D-block_contraction wikiPageID "14691611".
- D-block_contraction wikiPageLength "4040".
- D-block_contraction wikiPageOutDegree "59".
- D-block_contraction wikiPageRevisionID "613509651".
- D-block_contraction wikiPageWikiLink Aluminium.
- D-block_contraction wikiPageWikiLink Argon.
- D-block_contraction wikiPageWikiLink Arsenic.
- D-block_contraction wikiPageWikiLink Boron.
- D-block_contraction wikiPageWikiLink Boron_group.
- D-block_contraction wikiPageWikiLink Bromine.
- D-block_contraction wikiPageWikiLink Category:Chemical_bonding.
- D-block_contraction wikiPageWikiLink Gallium.
- D-block_contraction wikiPageWikiLink Germanium.
- D-block_contraction wikiPageWikiLink Group_3_element.
- D-block_contraction wikiPageWikiLink Helium.
- D-block_contraction wikiPageWikiLink Indium.
- D-block_contraction wikiPageWikiLink Inert_pair_effect.
- D-block_contraction wikiPageWikiLink Ionization_energy.
- D-block_contraction wikiPageWikiLink Joule.
- D-block_contraction wikiPageWikiLink Krypton.
- D-block_contraction wikiPageWikiLink Lanthanide_contraction.
- D-block_contraction wikiPageWikiLink Lanthanum.
- D-block_contraction wikiPageWikiLink Mole_(unit).
- D-block_contraction wikiPageWikiLink Neon.
- D-block_contraction wikiPageWikiLink Noble_gas.
- D-block_contraction wikiPageWikiLink Period_4_element.
- D-block_contraction wikiPageWikiLink Scandium.
- D-block_contraction wikiPageWikiLink Selenium.
- D-block_contraction wikiPageWikiLink Thallium.
- D-block_contraction wikiPageWikiLink Xenon.
- D-block_contraction wikiPageWikiLink Yttrium.
- D-block_contraction wikiPageWikiLink File:D-block_contraction--EN.png.
- D-block_contraction wikiPageWikiLinkText "d-block contraction".
- D-block_contraction wikiPageWikiLinkText "d-block".
- D-block_contraction wikiPageUsesTemplate Template:Greenwood&Earnshaw.
- D-block_contraction wikiPageUsesTemplate Template:Lowercase.
- D-block_contraction subject Category:Chemical_bonding.
- D-block_contraction hypernym Term.
- D-block_contraction comment "d-block contraction (sometimes called scandide contraction) is a term used in chemistry to describe the effect of having full d orbitals on the period 4 elements. The elements in question are Ga, Ge, As, Se and Br. Their electronic configurations include completely filled d orbitals (d10). d-block contraction is best illustrated by comparing some properties of the group 13 elements to highlight the effect on gallium.Gallium can be seen to be anomalous.".
- D-block_contraction label "D-block contraction".
- D-block_contraction sameAs Q5203310.
- D-block_contraction sameAs Contracción_del_bloque_d.
- D-block_contraction sameAs Contrazione_del_blocco_d.
- D-block_contraction sameAs m.03gt7nz.
- D-block_contraction sameAs Q5203310.
- D-block_contraction wasDerivedFrom D-block_contraction?oldid=613509651.
- D-block_contraction depiction D-block_contraction--EN.png.
- D-block_contraction isPrimaryTopicOf D-block_contraction.