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

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Radiation

High energy particles or rays emitted during the nuclear decay processes.

Photon

A packet of light or electromagnetic radiation, also called quantum of light.

 

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.

Solvent

The dispersing medium of a solution.

Periodic Law

The properties of the elements are periodic functions of their atomic numbers.

Bond Energy

The amount of energy necessary to break one mole of bonds of a given kind (in gas phase).The amount of energy necessary to break one mole of bonds in a substance, dissociating the sustance in the gaseous state into atoms of its elements in the gaseous state.

Coefficient of expansion

The ratio of the change in length or volumen of a body to the original lengthor volume for a unit change in temperature.

Hybridization

Mixing a set of atomic orbitals to form a new set of atomic orbitals with the same total electron capacity and with properties and energies intermediate between those of the original unhybridized orbitals.

Double Bond

Covalent bond resulting from the sharing of four electrons (two pairs) between two atoms.

Capillary Action

The drawing of a liquid up the inside of a small-bore tube when adhesive forces exceed cohesive forces, or the depression of the surface of the liquid when cohesive forces exceed the adhesive forces.