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Closed glass tube containing a gas under low pressure, with electrodes near the ends and a luminescent screen at the end near the positive electrode, produces cathode rays when high voltage is applied.

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Electrolytic Conduction

Conduction of electrical current by ions through a solution or pure liquid.

Nodal Plane

A region in which the probability of finding an electron is zero.

 

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

Coordinate Covalent Bond

A covalent bond in which both shared electrons are donated by the same atom, a bond between a Lewis base and a Lewis acid.

Specific Heat

The amount of heat required to raise the temperature of one gram of substance one degree Celsius.

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.

Diamagnetism

Weak repulsion by a magnetic field.

Dispersed Phase

The solute-like species in a colloid.

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.

Allotropes

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