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The Chemical Glossary currently has 651 chemical entries. You may search the Chemical Glossary by entering the keyword in the search box or by browsing the entire chemical glossary by letter in alphabetical order.

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Hund's Rule

All orbitals of a given sublevel must be occupied by single electrons before pairing begins.

Excited State

Any state other than the ground state of an atom or molecule.

Pauli Exclusion Principle

No two electrons in the same atom may have identical sets of four quantum numbers.

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Water Equivalent

The amount of water that would absorb the same amount of heat as the calorimeter per degree temperature increase.

End Point

The point at which an indicator changes colour and a titration is stopped.

Solvolysis

The reaction of a substance with the solvent in which it is dissolved.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Deposition

The direct solidification of a vapor by cooling, the reverse of sublimation.

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.