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Covalent bond in which there is an unsymmetrical distribution of electron density.

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Ozone

We breathe 24 hours a day, 7 days a week, consuming about 25 kg of air every day. It turns out that we practically predetermine our health by the air we breathe.

Overlap

The interaction of orbitals on different atoms in the same region of space.

Chemical Periodicity

The variations in properties of elements with their position in the periodic table.

Cathode Ray Tube

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.

Heterogeneous Mixture

A mixture that does not have uniform composition and properties throughout.

Valence Electrons

Outermost electrons of atoms, usually those involved in bonding.

Alkali Metals

Metals of Group IA (Na, K, Rb).

Water Equivalent

The amount of water that would absorb the same amount of heat as the calorimeter per degree temperature increase.

Radioactive Dating

Method of dating ancient objects by determining the ratio of amounts of mother and daughter nuclides present in an object and relating the ratio to the object?s age via half-life calculations.

Lewis Base

Any species that can make available a share in an electron pair.