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Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

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Hydrate Isomers

Isomers of crystalline complexes that differ in whether water is present inside or outside the coordination sphere.

Band

A series of very closely spaced, nearly continuous molecular orbitals that belong to the crystal as a whole.

Contact Process

Industrial process by which sulfur trioxide and sulfuric acid are produced from sulfur dioxide.

Carbanion

An organic ion carrying a negative charge on a carbon atom.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Domain

A cluster of atoms in a ferromagnetic substance, all of which align in the same direction in the presence of an external magnetic field.

Suspension

A heterogeneous mixture in which solute-like particles settle out of solvent-like phase some time after their introduction.

Critical Point

The combination of critical temperature and critical pressure of a substance.

yttria

Y2O3: A white, water-insoluble powder, Y2O3, used chiefly in incandescent gas and acetylene mantles.