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Chemical formula

shows the kinds and numbers of atoms in the smallest representative unit of a substance

Valence electrons

electrons in the highest occupied energy level of an element's atoms

Electron Dot Structure

A diagram that shows valence electrons as dots

Octet Rule

In forming compounds, atoms tend to react so as to acquire the stable electron configuration of a noble gas

Halide ion

a negative ion formed when a halogen atom gains an electron

Formula Unit

the lowest whole-number ratio of ions in an ionic compound

Ionic bonds

the electrostatic attraction that binds oppositely charged ions together

Coordination Number

the number of ions of opposite charge that surround the ion in a crystal

metallic bonds

the attraction of free-floating valence electrons for positively charged metal ions

Ionic compounds

compounds composed of cations and anions


a mixture of two or more elements, at least one of which is a metal


negatively charged ions


positively charged ions

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