Nonvirtual member functions

• float radius() - return the atom radius.
• float mass() - return the atom mass.
• float charge() - return the atom charge.
• float beta() - return the atom beta value.
• float occup() - return the atom occupancy value.
• void add_bond(int, BackboneType) - add a new bond to this atom, which connects this atom and the specified atom, of the given bond type.
• int bonded(int a) - return TRUE if this atom is bonded to the specified atom.