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An equation that describes the behavior of matter in a given state, the van der Waals equation describes the behavior of the gaseous state.

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Unsaturated Hydrocarbons

Hydrocarbons that contain double or triple carbon-carbon bonds.

Lanthanides

Elements 58 to 71 (after lanthanum).

Amorphous Solid

A noncrystalline solid with no well-defined ordered structure.

Isomorphous

Refers to crystals having the same atomic arrangement.

Central Atom

An atom in a molecule or polyatomic ion that is bonded to more than one other atom.

Delocalization

Of electrons, refers to bonding electrons that are distributed among more than two atoms that are bonded together, occurs in species that exhibit resonance.
The formation of a set of molecular orbitals that extend over more than two atoms, important in species that valence bond theory describes in terms of resonance.

Molality

Concentration expressed as number of moles of solute per kilogram of solvent.

Neutron

A neutral subatomic particle having a mass of 1.0087 amu.

Essential Oil

A plant extract that has a distinctive odour or flavour.

Atom

The smallest particle of an element.