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valence electrons

the electrons that are in the outermost (highest) energy level and are held the most losely

electron dot diagram

shows the number of valence (outermost) electrons in an atom; consists of a chemical symbol surrounded by dots

chemical bond

force of attraction that holds two atoms together as a result of the rearrangement of electrons between them

ion

an atom or group of atoms that has/have a charge

polyatomic ions

a charged group of atoms that act as a single unit

ionic bond

the attraction between two oppositely charged ions

ionic compound

a compound that consists of positive and negative ions held together by their attraction for one another

chemical formula

a combination of symbols that that shows the ratio of elements in a compound

subscript

a number written behind a chemical symbol that tells you the ratio of elements in a compound

crystal

an orderly, three dimensional arrangement of ions

covalent bond

the chemical bond formed when two atoms share electrons

molecule

a neutral group of atoms joined by covalent bonds

double bond

two atoms sharing two pairs of electrons

triple bond

two atoms sharing three pairs of electrons

molecular compound

a compound that is made up of atoms held together by covalent bonds

polar bond

a covalent bond in which two electrons are shared unequally

nonpolar bond

a covalent bond in which two electrons are shared equally

alloy

a mixture of two or more elements that has the properties of a metal; one of the combined elements MUST be a metal

metallic bond

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

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