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Across 4. the electrostatic force that holds oppositely charged particles together in an ionic compound 9. the electrons present in the outer energy levels of the bonding metallic atoms that are not held by any specific atom 12. a negatively charged ion 13. a positively charged ion 14. the charge of a monatomic ion 16. the attraction of a metallic cation for delocalized electrons 17. a polyatomic ion composed of an element, usually a nonmetal, bonded to one or more oxygen atoms

Down 1. the force that holds two atoms together 2. ions made up of more than one atom 3. the energy required to separate 1 mol of the ions of an ionic compound 5. a three-dimensional geometric arrangement of particles 6. this proposes that all the metal atoms in a metallic solid contribute their valence electrons to form a “sea” of electrons 7. an ionic compound whose aqueous solution conducts an electric current 8. compounds that contain ionic bonds 10. a one-atom ion 11. the chemical formula for an ionic compound 15. a mixture of elements that has metallic properties