virtual bool SetRadius(double radius)
Set the ``radius'' property of an atom. The default value is 0.0.
The assigned radius may be retrieved using the
OEAtomBase::GetRadius
method. The radius property is
typically used to hold a Van der Waal's or ionic radius for a given
atom when passing an OEMolBase to an algorithm requiring some form
of radii, such as a surface area calculation.