lanthanide contraction

lanthanide contraction
noun
: the decrease in size (as of radii of atoms or ions or of atomic volumes) with increasing atomic number of the metals of the lanthanide series

Useful english dictionary. 2012.

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  • Lanthanide contraction — is a term used in chemistry to describe different but closely related concepts associated with smaller than expected ionic radii of the elements in the lanthanide series (atomic number 58, Cerium to 71, Lutetium).CauseVery simply, the effect… …   Wikipedia

  • lanthanide contraction — ▪ chemistry also called  lanthanoid contraction        in chemistry, the steady decrease in the size of the atoms and ions of the rare earth elements (rare earth element) with increasing atomic number from lanthanum (atomic number 57) through… …   Universalium

  • lanthanide contraction — noun the progressive decrease in the radii of atoms of the lanthanide elements as the atomic number increases; evident in various physical properties of the elements and their compounds …   Wiktionary

  • Lanthanide triflates — are triflate salts of the lanthanide family with many uses in organic chemistry as Lewis acid catalysts. The catalysts act similar to aluminium chloride or ferric chloride, but are stable in water, which makes it possible to use water as solvent… …   Wikipedia

  • Contraction — may refer to: In physiology: Muscle contraction, one that occurs when a muscle fiber lengthens or shortens Uterine contraction, contraction of the uterus, such as during childbirth Contraction, a stage in wound healing In linguistics: Synalepha,… …   Wikipedia

  • Contraction des lanthanides — La contraction des lanthanides ou contraction lanthanidique désigne, en chimie, le fait que le rayon ionique des lanthanides décroît significativement lorsque le numéro atomique augmente, pour les atomes non chargés ou des ions possédant la même… …   Wikipédia en Français

  • Lanthanide —   1 2   3 4 5 6 7 8 9 …   Wikipédia en Français

  • d-block contraction — Atomic radius of elements of the groups 2,13 and 14. It shows d block contraction , especially for Ga and Ge d block contraction (sometimes called scandide contraction) is a term used in chemistry to describe the effect of having full d orbitals… …   Wikipedia

  • 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 the Ga, Ge, As, Se and Br. Their electronic configurations include… …   Wikipedia

  • Atomic radius — Diagram of a helium atom, showing the electron probability density as shades of gray. The atomic radius of a chemical element is a measure of the size of its atoms, usually the mean or typical distance from the nucleus to the boundary of the… …   Wikipedia

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