chapter 16 Flashcards
ionic
metal + nonmetal
crystaline solid
molecular, has a structure
amorphous solid
molecular, no structure
polycrystaline
molecular, has both structure and no structure
allotropes
alternate forms of the same element in a different structure
metallic solids
consists of cations held together in a sea of electrons
how many atoms in primitive cubic?
1 atom
how many atoms body centered cubic?
2 atoms
how many atoms in face centered cubic?
4 atoms
fraction of atom in corner
1/8
fraction of atom on face
1/2
primitive atomic radius formula
r = a/2
bcc atomic radius formula
r = sqrt(2)a/4
fcc atomic radius formula
r = sqrt(3)a/4
hexagonal closed packed structure (hcp)
coordination number 12
cubic closed packed structure (ccp)
coordination number 12
tetrahedral hole
4 atoms come together
octahedral hole
6 atoms come together
rock salt structure
ionic structure, ratio (Rsmaller/Rlarger) 0.4-0.7, coordination (6,6)
cesium chloride structure
ionic structure, ratio > 0.7, BCC, coordination (8,8)
zinc blend
ionic structure, ratio < 0.4, tetrahedral holes, coordination (6,6)
