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A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

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Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Allotropes

Different forms of the same element in the same physical state.

Allotropic Modifications (Allotropes)

Different forms of the same element in the same physical state.

Ampere

Unit of electrical current, one ampere equals one coulomb per second.

 

Homogeneous Catalyst

A catalyst that exists in the same phase (solid, liquid or gas) as the reactants. The process is called Homogeneous Catalysis.

Alloying

Mixing of metal with other substances (usually other metals) to modify its properties.

Homologous Series

A series of compounds in which each member differs from the next by a specific number and kind of atoms.

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Gas of rotten eggs

If you happen to break a rotten egg, then you know the smell of hydrogen sulfide, because the stench of the spoiled egg depends on of its presence in rotting protein substances.

Isotopes

Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.