Chem 1C - Chapter 16

Crystalline solid

highly ordered throughout

Amorphous solid

short-range order, long-range order

Ionic solids

brittle, high melting point

ex. NaCl

Molecular solids

held together by IMF’s

intermolecular vs intramolecular

Intermolecular forces are the attractions between molecules. Intramolecular forces are those within the molecule.

atomic solids

held together by covalent bonds, made entirely of one element, high melting point

metallic solids

metal cations are held together by delocalized electrons, good electrical conductors, strong but malleable, variable melting points

unit cell

smallest repeating unit of a lattice

corner postition

¼ atom

edge position

½ atom

interior position

1 atom

non-closest packed:

simple cubic, body-centered cubic