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A thermodynamic state or property that measures the degree of disorder or randomness of a system.

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Electron Configuration

Specific distribution of electrons in atomic orbitals of atoms or ions.

Standard Entropy

The absolute entropy of a substance in its standard state at 298 K.

Deuterium

An isotope of hydrogen whose atoms are twice as massive as ordinary hydrogen,deuterion atoms contain both a proton and a neutron in the nucleus.

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Artificial Transmutation

An artificially induced nuclear reaction caused by the bombardment of a nucleus with subatomic particiles or small nucei.

Eutrophication

The undesirable overgrowth of vegetation caused by high concentrates of plant nutrients in bodies of water.

Amphoterism

The ability to react with both acids and bases.Ability of substance to act as either an acid or a base.

History of fireworks

There is an assumption that the history of fireworks started in China, about 2000 years ago. It is possible that the Chinese accidentally discovered explosions by burning bamboo canes.

Nitrogenases

A class of enzymes found in bacteria within root nodules in some plants, which catalyze reactions by which N2 molecules from the air are converted to ammonia.

 

Sigma Orbital

Molecular orbital resulting from head-on overlap of two atomic orbitals.