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A process for the catalyzed industrial production of ammonia from N2 and H2 at high temperature and pressure.

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Molecular Orbital

An orbit resulting from overlap and mixing of atomic orbitals on different atoms. An MO belongs to the molecule as a whole.

Wild patina, is it so bad?

Usually this kind of patina appears on monuments. The most striking example is the Statue of Liberty in New York.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Evaporization

Vaporization of a liquid below its boiling point.

Solution

Homogeneous mixture of two or more substances.

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.

Potential Energy

Energy that matter possesses by virtue of its position, condition or composition.

Substitution Reaction

A reaction in which an atom or a group of atoms is replaced by another atom or group of atoms.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Dynamic Equilibrium

An equilibrium in which processes occur continuously, with no net change. When two (or more) processes occur at the same rate so that no net change occurs.