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Energy required to pair two electrons in the same orbital.

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Chemistry of the sky

Chemistry can teach us about the composition of celestial bodies and determine their age.

Periodicity

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

Ion

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

Nitrogen Cycle

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

 

Chemical Periodicity

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

Group

A vertical column in the periodic table, also called a family.

Reversible Reaction

Reactions that do not go to completion and occur in both the forward and reverse direction.

Nuclide Symbol

Symbol for an atom A/Z E, in which E is the symbol of an element, Z is its atomic number, and A is its mass number.

Metallic Conduction

Conduction of electrical current through a metal or along a metallic surface.

Electrolysis

Process that occurs in electrolytic cells.