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Molecular orbital resulting from head-on overlap of two atomic orbitals.

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Allotropes

Different forms of the same element in the same physical state.

Alpha Particles

A helium nucleus.

Isomers

Different substances that have the same formula.

Debye

The unit used to express dipole moments.

Noble Gases (Rare Gases)

Elements of the periodic Group 0, also called rare gases, formerly called inert gases, He,Ne,Ar, Kr, Xe, Rn.

Viscosity

Resistance offered by the molecules of a liquid to flow is termed as viscosity.

Lanthanides

Elements 58 to 71 (after lanthanum).

Colloid

A heterogeneous mixture in which solute-like particles do not settle out.

Explosive

A chemical or compound that causes a sudden, almost instantaneous release or pressure, gas, heat and light when subjected to sudden shock, pressure, high temperature or applied potential.

Dissociation

In aqueous solution, the process in which a solid ionic compound separates into its ions.