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Two or more forms of atoms of the same element with different masses, atoms containing the same number of protons but different numbers of neutrons.

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Substance

Any kind of matter all specimens of which have the same chemical composition and physical properties.

 

Activity Series

A listing of metals (and hydrogen) in order of decreasing activity.

Solubility Product Principle

The solubility product constant expression for a slightly soluble compound is the product of the concentrations of the constituent ions, each raised to the power that corresponds to the number of ions in one formula unit.

xenon trioxide

A colorless, nonvolatile solid, XeO3, explosive when dry: in solution it is called xenic acid.

Chemical Periodicity

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

Dipole Moment

The product of the distance separating opposite charges of equal magnitude of the charge, a measure of the polarity of a bond or molecule, a measured dipole moment refers to the dipole moment of an entire molecule.

Dipole

Refers to the separation of charge between two covalently bonded atoms.

Dermal toxicity

Adverse health effects resulting from skin exposure ot a substance.

Hydrogen-Oxygen Fuel Cell

Fuel cell in which hydrogen is the fuel (reducing agent) and oxygen is the oxidizing agent.

 

Polymorphous

Refers to substances that crystallize in more than one crystalline arrangement.