Chapter 12 key terms Flashcards
What are metallic solids?
metals atoms held together by a “sea” of collectively shared electrons
What are ionic solids?
sets of cations and anions mutually attracted to one another by electrostatic attraction
What are covalent-network solids?
joined by an extensive network of covalent bonds
What are molecular solids?
discrete molecules held together by intermolecular forces
What are nanomaterials?
crystalline compounds with the crystals on the order 1-100 nm
What are polymers?
solids that contain long chains of atoms connected by covalent bonds; the chains can be connected to other chains by weak forces
What makes a solid crystalline?
they have a regular repeating pattern of atoms
What makes a solid amorphous?
they have a distinct lack of order in the arrangement of atoms
What is a unit cell?
the basis of a repeating pattern
What is the structure of a crystalline solid defined by?
-the size and shape of the unit cell
-the locations of the atoms within the unit cell
What is the crystal lattice?
the geometric pattern on which the unit cell is based
What are lattice points?
positions that define the overall structure of the crystalline compound
What are lattice vectors?
they connect the point and define the unit cell
Where are the lattice points in a primitive or simple cubic lattice?
at the corners
Where are the lattice points in body center cubic?
at corners plus one in the midlle
