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Energy required to pair two electrons in the same orbital.

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Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Diamonds Are Forever

Diamonds are still a girl's best friend, right? We love the shiny gems. They are the most popular rocks sold today. But what exactly are they, anyway? Where do they come from? What else are they used for?

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Homogeneous Mixture

A mixture which has uniform composition and properties throughout.

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.

Octet Rule

Many representative elements attain at least a share of eight electrons in their valence shells when they form molecular or ionic compounds, there are some limitations.

Cation

A positive ion, an atom or group of atoms that has lost one or more electrons.

Half-Reaction

Either the oxidation part or the reduction part of a redox reaction.

Cis-Trans Isomerism

A type of geometrical isomerism related to the angles between like ligands.

Stereoisomers

Isomers that differ only in the way that atoms are oriented in space, consist of geometrical and optical isomers.