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The arrangement of atoms (not lone pairs of electrons) around a central atom of a molecule or polyatomic ion.

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Nitrogen Cycle

The complex series of reactions by which nitrogen is slowly but continually recycled in the atmosphere, lithosphere and hydrosphere.

 

Law of Conservation of Matter and Energy

The total amount of matter and energy available in the universe is fixed.

Hydride

A binary compound of hydrogen.

 

Paramagnetism

Attraction toward a magnetic field, stronger than diamagnetism, but still weak compared to ferromagnetism.

Ostwald Process

A process for the industrial production of nitrogen oxide and nitric acid from ammonia and oxygen.

Electron Affinity

The amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a 1- charge, has a negative value if energy is released.

Periodicity

Regular periodic variations of properties of elements with atomic number (and position in the periodic table).

Nonelectrolyte

A substance whose aqueous solutions do not conduct electricity.

Formula Weight

The mass of one formula unit of a substance in atomic mass units.

 

Binary Compound

A compound consisting of two elements, may be ionic or covalent.