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ionic compound compound composed of anions and cations ionic bond the electrostatic forces that hold ions together in ionic compounds neutral Ionic compoounds are electrically ___________. chemical formula represents the composition of substances, shows the kinds and numbers of atoms in the smallest repreentative unit of a substance formula unit the lowest whole-number ratio of ions in an ionic compound valence electrons the electrons in the highest occupied energy level of an element's atoms octet rule in forming compounds, atoms tend to achieve the electron configuration of a noble gas hallide ions ions produced when atoms of halogens gain electrons electron dot structure diagrams that show valence electrons as dots high melting points Ionic compounds generally have _____ _____ ______. crystalline solids Most ionic compounds are _______ ______ at room temperature. coordination number the number of ions of opposite charge that surround the ion in a crystal melted, dissolved Ionic compunds can conduct an electric current when ________ or _______ in water. metallic bond consist of the attraction of the free-floating valence electrons for the positively charged metal ions alloy mixtures composed of two or more elements, at least one of which is a metal valence, sea The _______ electrons of metal atmos can be modeled as a ___ of electrons. compact, orderly Metal atoms are arranged in very _______ and ________ patterns. superior Alloys are importance because their properties are often __________ to those of their component elements.