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Chemical bond

the attractive force that holds atoms or ions together

Chemical structure

the arrangement of bonded atoms or ions with in a substance


the smallest unit of a substance that exhibits all of the properties characteristic of that substance


a substance made of atoms of more than one element bonded together

Ionic bond

a bond formed by the attraction between oppositely charged ions

Metallic bond

a bond formed by the attraction between positively charge metal ions and the electrons around them

Covalent bond

a bond formed when atoms share one or more pairs of electrons

Polyatomic ion

an ion made of two or more atoms that are covalently bonded and that act like a single ion

Empirical Formula

the simplest chemical formula of a compound that tells the smallest whole-number ratio of atoms in the compound

Molecular Formula

a chemical formula that reports the actual numbers of atoms in one molecule of a compound


an ion with a positive charge


an ion with a negative charge


the elements that are good conductors of heat and electricity


the elements that are usually poor conductors of heat and electricity


elements that have characteristics of both metals and nonmetals

Valance Electron

an electron in the outermost energy level of an atom

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