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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.

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Allotropes

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

Oxidizing Agent

The substance that oxidizes another substance and is reduced.

Donor Atom

A ligand atom whose electrons are shared with a Lewis acid.

Metal

An element below and to the left of the stepwise division (metalloids) in the upper right corner of the periodic table, about 80% of the known elements are metals.

Alkyl Group

A group of atoms derived from an alkane by the removal of one hydrogen atom.

Frequency

The number of repeating corresponding points on a wave that pass a given observation point per unit time.

Carcinogen

A substance capable of causing or producing cancer in mammals.

 

Halogens

Group VIIA elements: F, Cl, Br, I

Emulsifying Agent

A sustance that coats the particles of the dispersed phase and prevents coagulation of colloidal particles, an emulsifier.

Molecular Weight

The mass of one molecule of a nonionic substance in atomic mass units.