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Unformatted text preview: on between ions of
opposite charges. Ionic crystals are regular repeating arrays of positive and negative
ions, packed so that each positive ion is surrounded by negative ions and vice versa in a
3 dimensional lattice structure. Ionic crystals have high melting and boiling points, are
water soluble (water solubility varies considerably) and conduct electricity when molten
or in aqueous solution, but not in the solid state, as ions are not free to move about in a
solid ionic crystal.
3. Metals are good conductors of electricity and heat, ductile and malleable. Metals have
low ionization energies and vacant valence orbitals. Metals consist of regular, repeating
arrangements of metal ions (cations) in which the bonding electrons are mobile or
delocalized and can move rapidly through the metal, since an electron is much smaller
than the spaces between the cations. This explains high conductivity of elements.
Electrons can acquire large amounts of kinetic energy and rapidly transfer it to cooler
parts of the metal:...
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This note was uploaded on 09/23/2010 for the course CS 001 taught by Professor Jix during the Spring '10 term at Riverside Community College.
- Spring '10