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Chapter 7

Across
a compound composed of positive and negative ions
a notation that depicts valence electrons as dots around the atomic symbol of the element; the symbol represents the inner electrons and atomic nucleus; also called Lewis dot structure
the lowest whole-number ratio of ions in an ionic compound; in magnesium chloride, the ratio of magnesium ions to chloride ions is 1:2 and the formula unit is MgCl
a mixture composed of two or more elements, at least one of which is a metal
an electron in the highest occupied energy level of an atom
a negative ion formed when a halogen atom gains an electron
Down
the electrostatic attraction that binds oppositely charged ions together
an expression that indicates the number and type of atoms present in the smallest representative unit of a substance
the number of ions of opposite charge that surround each ion in a crystal
the force of attraction that holds metals together; it consists of the attraction of free-floating valence electrons for positively charged metal ions
atoms react by gaining or losing electrons so as to acquire the stable electron structure of a noble gas, usually eight valence electrons