In [1]:

```
# Variables
e1 = -13.6; #ionization potential of hydrogen in volts
n = 3.; #third orbit
m = 5.; #fifth orbit
# Calculations
e3 = e1/(n**2); #Energy of third orbit in volts
e5 = e1/(m**2); #Energy of fifth orbit in volts
# Results
print "Energy of third orbit (in volts) = %.2f eV"%e3
print "Energy of fifth orbit (in volts) = %.2f eV"%e5
```

In [2]:

```
# Variables
d = 0.9178; #molecular distance in angstorm
# Calculations
d1 = d*10**-10; #in m
e = 1.602*10**-19; #in C
dm = e*d1; #dipole moment in fully ionic state in Cm
dm_m = 6.375*10**-30; #meaured dipole moment in Cm
p = (dm_m*100)/dm; #Percentage ionic character
# Results
print "Dipole moment of HF in fully ionic state (in Cm) = %.3e Cm"%dm
print "Percentage ionic character : %.1f %%"%p
```