docs: def calculate_formal_charge(self,mol):
  		"""Calculates formal charge for each atom.
  		Takes:
  			* mol * - mol file in rdkit environment
  		Output:
  			* formal_charges * - list of charges
  		"""
  		formal_charges = []
  		for atom in mol.GetAtoms():
  			formal_charges.append(atom.GetFormalCharge())
  		return formal_charges