EASC 219- Crystal Structure questions with 100%
complete solutions A+ rated
1. Structure controls with
pack together to minimize void space to form a
metallic bonding
crystal structure; common configurations are
hexagonal clos- est packing (HCP), cubic closest
packing (CCP), and Body centered
configuration
2. coordination number the number of ions of opposite charge that
surround
each ion in a crystal
3. Why are metals dense in regards to because of the closeness of packing and
the relative
metallic bonding configuration?
4. less dense packing leads to 8.
what configuration and
density?
5. Structure controls with
covalent bonding
6. rules to maximize stabilization
of a crystal structure
7. Pauling's Rules #1: The
coordina- tion principle
1/
10
, EASC 219- Crystal Structure questions with 100%
complete solutions A+ rated
igh atomic weights, most metal crystals have high den-
sities typically with CCP configuration
ody centered and less dense because less weight
from ions surrounding center like Fe
rystals are hard with high melting points-- bonding
with strong directional behaviour; atoms placed in
spe- cific orientations so orbitals can overlap;
prevents close packing
1. crystal structure must be electrically neutral
2. the cation-anion separation must be close to
equilib- rium inter ionic distance
3. the arrangement of ions must occur in a
regular pattern-- closely packed spheres
coordination polyhedron forms around each cation.
The cation and anion distance is determined by
the sum of the cation and anion radii, and the
number of anions coordinating with the cation is
determined by the relative size of the cation and
anion
2/
10
complete solutions A+ rated
1. Structure controls with
pack together to minimize void space to form a
metallic bonding
crystal structure; common configurations are
hexagonal clos- est packing (HCP), cubic closest
packing (CCP), and Body centered
configuration
2. coordination number the number of ions of opposite charge that
surround
each ion in a crystal
3. Why are metals dense in regards to because of the closeness of packing and
the relative
metallic bonding configuration?
4. less dense packing leads to 8.
what configuration and
density?
5. Structure controls with
covalent bonding
6. rules to maximize stabilization
of a crystal structure
7. Pauling's Rules #1: The
coordina- tion principle
1/
10
, EASC 219- Crystal Structure questions with 100%
complete solutions A+ rated
igh atomic weights, most metal crystals have high den-
sities typically with CCP configuration
ody centered and less dense because less weight
from ions surrounding center like Fe
rystals are hard with high melting points-- bonding
with strong directional behaviour; atoms placed in
spe- cific orientations so orbitals can overlap;
prevents close packing
1. crystal structure must be electrically neutral
2. the cation-anion separation must be close to
equilib- rium inter ionic distance
3. the arrangement of ions must occur in a
regular pattern-- closely packed spheres
coordination polyhedron forms around each cation.
The cation and anion distance is determined by
the sum of the cation and anion radii, and the
number of anions coordinating with the cation is
determined by the relative size of the cation and
anion
2/
10
