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Valence Electron

The electrons that are in the highest energy level of an atom and that are involved in chemical reactions..

Electron Dot Diagram

A representation of the valence electrons in an atom, using dots.

Chemical Bond

The force that holds atoms together.

Ion

An atom or group of atoms that has become electrically charged.

Polyatomic Ion

An ion that is made of more than one atom.

Ionic Bond

The attraction between oppositely charged ions.

Ionic Compound

A compound that consists of positive and negative ions.

Chemical Formula

A combination of symbols that represents the elements in a compound and their proportions.

Subscript

A number in a chemical formula that tells the number of atoms in a molecule or the ratio of elements in a compound

Crystal

An orderly, three-dimensional pattern of ions or atoms in a solid.

Covalent Bond

A chemical bond formed when two atoms share electrons.

Molecule

A neutral group of atoms joined by covalent bonds.

Double Bond

A chemical bond formed when atoms share two pairs of electrons

Triple Bond

A chemical bond formed when atoms share three pairs of electrons.

Molecular Compound

A compound that is composed of molecules (covalently bound together).

Polar Bond

A covalent bond in which electrons are shared unequally.

Nonpolar Bond

A covalent bond in which electrons are shared equally.

Alloy

A mixture made of two or more elements, one of which is a metal.

Metallic Bond

An attraction between a positive metal ion and the electrons surrounding it.

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