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Noble Gases02:54

Noble Gases


The elements in group 18 are noble gases (helium, neon, argon, krypton, xenon, and radon). They earned the name “noble” because they were assumed to be nonreactive since they have filled valence shells. In 1962, Dr. Neil Bartlett at the University of British Columbia proved this assumption to be false.
The Periodic Table03:25

The Periodic Table

As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
Elements: Chemical Symbols and Isotopes02:31

Elements: Chemical Symbols and Isotopes

A chemical symbol is an abbreviation used to indicate an element or an atom of an element. For example, the symbol for mercury is Hg. The same symbol is used to indicate one atom of mercury (microscopic domain) or to label a container of many atoms of the element mercury (macroscopic domain).
Some symbols are derived from the common English name of the element; others are abbreviations of the name in another language — Latin, Greek or German. For example, the symbol for aluminum (common name)...
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.

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Video Experimental Relacionado

Updated: Jun 24, 2026

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
09:46

Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5

Published on: August 25, 2016

Zeolita RHO-tipo de red con los elementos más ligeros.

Tao Wu1, Jian Zhang, Cong Zhou

  • 1Department of Chemistry, University of California, Riverside, California 92521, USA.

Journal of the American Chemical Society
|April 16, 2009
PubMed
Resumen
Este resumen es generado por máquina.

Dos nuevos marcos covalentes metal-orgánicos (MOCOF) ofrecen las estructuras RHO de zeolita más ligeras, demostrando una capacidad excepcional de almacenamiento de CO2 debido a sus poros internos altamente porosos y accesibles.

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Adsorption Device Based on a Langatate Crystal Microbalance for High Temperature High Pressure Gas Adsorption in Zeolite H-ZSM-5
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Área de la Ciencia:

  • Ciencia de los materiales Ciencia de los materiales.
  • Nanotecnología La nanotecnología es la nanotecnología.
  • Química Química es la química.

Sus antecedentes:

  • Los marcos orgánicos metálicos (MOF) y los marcos orgánicos covalentes (COF) se establecen como materiales porosos.
  • La integración de MOF y COF en una sola clase de material, denominada MOCOF, presenta nuevas oportunidades para funcionalidades avanzadas.

Objetivo del estudio:

  • Informar sobre la síntesis y caracterización de dos MOCOFs novedosos y altamente porosos.
  • Investigar las relaciones estructura-propiedad, centrándose particularmente en la porosidad y las capacidades de almacenamiento de gas.

Principales métodos:

  • Síntesis de materiales MOCOF utilizando grupos de sustitución específicos en los anillos de imidazolilo.
  • Caracterización de la estructura de los poros, la superficie y la capacidad de adsorción de CO2.

Principales resultados:

  • Se sintetizaron dos nuevos MOCOF, que representan las estructuras RHO de zeolita más ligeras conocidas.
  • Los materiales exhiben una gran superficie (1818 m2/g) y una alta capacidad de almacenamiento de CO2 (35,6 cm3/g a 760 Torr y 273 K).
  • La síntesis demostró un equilibrio exitoso entre los efectos de dirección de la estructura y de estrechamiento de los poros.

Conclusiones:

  • Los MOCOFs desarrollados poseen una topología RHO de zeolita única con poros altamente accesibles.
  • Estos materiales muestran un potencial significativo para aplicaciones de captura y almacenamiento de CO2.