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Related Concept Videos

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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Related Experiment Video

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

Zeolite RHO-type net with the lightest elements.

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
Summary
This summary is machine-generated.

Two new metal-organic covalent frameworks (MOCOFs) offer the lightest zeolite RHO structures, demonstrating exceptional CO2 storage capacity due to their highly porous and accessible internal pores.

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Last 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

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Nanostructured Ag-zeolite Composites as Luminescence-based Humidity Sensors
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Published on: November 15, 2016

Area of Science:

  • Materials Science
  • Nanotechnology
  • Chemistry

Background:

  • Metal-organic frameworks (MOFs) and covalent organic frameworks (COFs) are established porous materials.
  • Integrating MOFs and COFs into a single material class, termed MOCOFs, presents new opportunities for advanced functionalities.

Purpose of the Study:

  • To report the synthesis and characterization of two novel, highly porous MOCOFs.
  • To investigate the structure-property relationships, particularly focusing on porosity and gas storage capabilities.

Main Methods:

  • Synthesis of MOCOF materials utilizing specific substituent groups on imidazolyl rings.
  • Characterization of pore structure, surface area, and CO2 adsorption capacity.

Main Results:

  • Two new MOCOFs were synthesized, representing the lightest known zeolite RHO structures.
  • The materials exhibit a large surface area (1818 m²/g) and high CO2 storage capacity (35.6 cm³/g at 760 Torr and 273 K).
  • The synthesis demonstrated a successful balance between structure-directing and pore-narrowing effects.

Conclusions:

  • The developed MOCOFs possess unique zeolite RHO topology with highly accessible pores.
  • These materials show significant potential for CO2 capture and storage applications.