Knowra Hydration shell Hydration shell A hydration shell is the layer of water molecules arranged around an ion in aqueous solution. Its structure and mobility depend on the ion and its interactions with water.
Ion–dipole force : An electrostatic attraction between an ion and the partial charges of a polar molecule. It orients water molecules around the ion and stabilizes the shell.
Ion : An atom or molecule with a net electric charge caused by losing or gaining electrons. The shell forms around this charged solute.
Ionic conductivity : The ability of a material to conduct electric current through the movement of ions. Hydrated ion size and mobility help determine transport through water.
Lithium ion : A positively charged lithium atom, Li⁺, present in salts, solutions, and electrochemical systems. Its small size and high charge density produce a particularly strongly bound hydration environment.
Water molecule : A molecule composed of two hydrogen atoms bonded to one oxygen atom, with a bent shape and polar charge distribution. Its partial charges determine which end points toward a dissolved ion.
Ionic radius : A measure of the effective size of an ion in a crystal or chemical environment. Ion size influences how closely water molecules can approach.
Ion channel : A membrane protein that forms a selective pore for ions to cross a biological membrane. An ion often must shed part of its hydration shell to enter a narrow pore.
Cesium ion : A positively charged cesium atom, Cs⁺, found in aqueous salts and other chemical systems. Its large size contrasts with lithium’s compact, strongly interacting hydration shell.
Hydrogen bond : An attractive interaction involving a hydrogen atom bonded to an electronegative atom and another electronegative atom. Hydrogen bonding among nearby waters helps shape the shell’s structure.
Charge density : Electric charge distributed per unit volume, area, or length. A high charge density generally strengthens an ion’s attraction to water.
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