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A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

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Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Faraday

One faraday of electricity corresponds to the charge on 6.022 x 1023 electrons, or 96,487.301 coulombs.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Total Ionic Equation

Equation for a chemical reaction written to show the predominant form of all species in aqueous solution or in contact with water.

Condensed States

The solid and liquid states.

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Hydration Energy

The energy change accompanying the hydration of a mole of gase and ions.

Resonance

The concept in which two or more equivalent dot formulas for the same arrangement of atoms (resonance structures) are necessary to describe the bonding in a molecule or ion.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.