Ch 6: Chemical Bonds

electron dot diagram

a diagram of an atom, ion, or molecule in which each dot represents a valence electron

ion

an atom or group of atoms that has a positive or negative charge

anion

an ion with a negative charge

cation

an ion with a positive charge

chemical bond

the force that holds atoms or ions together as a unit

ionic bond

the force that holds cations and anions together

chemical formula

notation that shows what elements a compound contains and the ratio of the atoms or ions of these elements in the compound

crystals

solids whose particles are arranged in a lattice structure

covalent bond

a chemical bond in which two atoms share a pair of valence electrons

molecule

a neutral group of atoms that are joined together by one or more covalent bonds

polar covalent bond

a covalent bond in which electrons are not shared equally

polyatomic ion

a covalently bonded group of atoms that has a positive or negative charge and acts as a unit

metallic bond

the attraction between a metal cation and the shared electrons that surround it

alloy

a mixture of two or more elements, at least one of which is a metal, that has the characteristic properties of a metal