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A substance capable of causing or producing cancer in mammals.

 

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ytterbium

A rare metallic element found in gadolinite and forming compounds resembling those of yttrium. Symbol: Yb, at. wt.: 173.04, at. no.: 70, sp. gr.: 6.96. Cf."rare-earth element."

 

Photochemical Smog

A brownish smog occurring in urban areas receiving large amounts of sunlight, caused by photochemical (light-induced) reactions among nitrogen oxides, hydrocarbons and other components of polluted air that produce photochemical oxidants.

 

End Point

The point at which an indicator changes colour and a titration is stopped.

Lewis Dot Formula (Electron Dot Formula)

Representation of the core of a molecule, ion or formula unit by showing atomic symbols and only outer shell electrons.

Square Planar

A term used to describe molecules and polyatomic ions that have one atom in the center and four atoms at the corners of a square.

Allotropic Modifications (Allotropes)

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

Isomorphous

Refers to crystals having the same atomic arrangement.

Ion

An atom or a group of atoms that carries an electric charge.

Oxidation

An algebraic increase in the oxidation number, may correspond to a loss of electrons.

Acid

A substance that produces H+(aq) ions in aqueous solution. Strong acids ionize completely or almost completely in dilute aqueous solution. Weak acids ionize only slightly. Chemicals or substances having the property of an acid are said to be acidic.