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Oxidation of metals in the presence of air and moisture.

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Bond Order

Half the numbers of electrons in bonding orbitals minus half the number of electrons in antibonding orbitals. Bond order gives an indication to the stability of a bond. Also defined as the difference between the number of bonding electrons and antibonding electrons divided by two.

Ionic Geometry

The arrangement of atoms (not lone pairs of electrons) about the central atom of a polyatomic ion.

Isoelectric

Having the same electronic configurations.

Potential Energy

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

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

Barometer

A device for measuring pressure.

Oxide

A binary compound of oxygen.

Tetrahedral

A term used to describe molecules and polyatomic ions that have one atom in center and four atoms at the corners of a tetrahedron.

Molecular Orbital

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

Joule

A unit of energy in the SI system. One joule is 1 kg. m2/s2 which is also 0.2390 calorie.