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Electron Configuration of Multielectron Atoms03:26

Electron Configuration of Multielectron Atoms

The alkali metal sodium (atomic number 11) has one more electron than the neon atom. This electron must go into the lowest-energy subshell available, the 3s orbital, giving a 1s22s22p63s1 configuration. The electrons occupying the outermost shell orbital(s) (highest value of n) are called valence electrons, and those occupying the inner shell orbitals are called core electrons. Since the core electron shells correspond to noble gas electron configurations, we can abbreviate electron...
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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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A crystal's internal structure is an orderly array of atoms, ions, or molecules, and the details of this array significantly influence the solid's properties. In a crystal, periodically repeating 'structural motifs' - which could be atoms, molecules, or groups thereof - create a 'space lattice.' This is essentially a three-dimensional, infinite array of points, each surrounded by its neighbors in an identical way, forming the basic structure of the crystal.A 'unit cell' is a theoretical...
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Updated: May 17, 2026

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride
04:51

Comparison of Two Different Synthesis Methods of Single Crystals of Superconducting Uranium Ditelluride

Published on: July 8, 2021

Caesium diuranium hexa-telluride.

Adel Mesbah1, James A Ibers

  • 1Department of Chemistry, Northwestern University, 2145 Sheridan Road, Evanston, IL 60208, USA.

Acta Crystallographica. Section E, Structure Reports Online
|November 6, 2012
PubMed
Summary

Researchers synthesized single crystals of cesium uranium telluride (CsU(2)Te(6)) at 1273 K. This new material features infinite layers of uranium and tellurium, separated by cesium atoms, with linear tellurium chains.

Area of Science:

  • Materials Science
  • Solid State Chemistry
  • Crystallography

Background:

  • The synthesis and structural characterization of novel inorganic compounds are crucial for understanding chemical bonding and exploring new material properties.
  • Uranium-containing tellurides are of interest due to their unique electronic and magnetic behaviors.

Purpose of the Study:

  • To synthesize single crystals of a new cesium uranium telluride compound.
  • To determine the crystal structure and atomic arrangement of CsU(2)Te(6).

Main Methods:

  • Single crystal synthesis via high-temperature reaction of uranium, tellurium, and cesium telluride.
  • X-ray diffraction analysis to determine crystal structure and space group.

Main Results:

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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition
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Epitaxial Growth of Perovskite Strontium Titanate on Germanium via Atomic Layer Deposition

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  • Single crystals of CsU(2)Te(6) were successfully synthesized at 1273 K.
  • The compound crystallizes in the Cmcm space group, adopting the CsTh(2)Te(6) structure type.
  • The structure consists of [U(2)Te(6)] layers separated by Cs atoms, with infinite Te-Te-Te linear chains along [001].

Conclusions:

  • The crystal structure of CsU(2)Te(6) reveals a layered arrangement with unique tellurium chain motifs.
  • This discovery expands the family of known uranium chalcogenides and provides a basis for further physical property investigations.