In this section you will calculate the wavefunction
and the energy level diagrams for the
linear and cyclic H_{20} clusters.

**Exercise 1**: Start DLVisualize,
run a CRYSTAL calculation for the linear case:
H20_linear.inp

**Exercise 2**: Run a CRYSTAL properties calculation
of the energy level diagram

for the H_{20} linear cluster,
as explained in **Exercise 2**
for H_{4}.

**Exercise 3**: Run a CRYSTAL properties calculation
of the density of states

for the H_{20} linear cluster,
as explained in **Exercise 3**
for H_{4}.

**Exercise 4**: Run a CRYSTAL properties calculation
of the energy level diagram + the density of states

for the H_{20} linear cluster,
as explained in **Exercise 4**
for H_{4}.

**Exercise 5**: Start DLVisualize,
run a CRYSTAL calculation for the cyclic case:
H20_cyclic.inp

**Exercise 20**: Run a CRYSTAL properties calculation
of the energy level diagram

for the H_{20} cyclic cluster,
as explained in **Exercise 2**
for H_{4}.

**Exercise 7**: Run a CRYSTAL properties calculation
of the density of states

for the H_{20} cyclic cluster,
as explained in **Exercise 3**
for H_{4}.

**Exercise 8**: Run a CRYSTAL properties calculation
of the energy level diagram + the density of states

for the H_{20} cyclic cluster,
as explained in **Exercise 4**
for H_{4}.