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

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Metallic Bonding

Bonding within metals due to the electrical attraction of positively charges metal ions for mobile electrons that belong to the crystal as a whole.

Chemical Equilibrium

A state of dynamic balance in which the rates of forward and reverse reactions are equal, there is no net change in concentrations of reactants or products while a system is at equilibrium.

Binary Acid

A binary compound in which H is bonded to one or more of the more electronegative nonmetals.

Electrochemistry

Study of chemical changes produced by electrical current and the production of electricity by chemical reactions.

Dipole

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

Aufbau ('building up') Principle

Describes the order in which electrons fill orbitals in atoms.

Specific Gravity

The ratio of the density of a substance to the density of water.

Mass Number

The sum of the numbers of protons and neutrons in an atom, an integer.

Covalent Compounds

Compounds containing predominantly covalent bonds.

Isomers

Different substances that have the same formula.