Kindly refer to this page for details about adding atomic parameters in Autodock. Make sure you have the values for all the parameters suggested in this guide. In case you find any difficulty doing this, kindly write in the comment section. I will be able to help you with this.

http://autodock.scripps.edu/faqs-help/faq/how-do-i-add-new-atom-types-to-autodock-4

You get the parameter file to modify from this link. This is more precise and comprehensible. You just need to change four atom properties in the beginning and save the parameter file. Then, in the parameter files for AutoGrid and AutoDock (*.gpf and *.dpf files), add this command at the top of the file: parameter_file

Make sure you keep the parameter file in your working directory where all your generated files are located.

http://autodock.scripps.edu/faqs-help/how-to/adding-new-atom-parameters-to-autodock

Thank you Abu Turab Naqvi . Will try this out

Abu Turab Naqvi can you help me with finding the Vanderwaal well depth and atomic solvation parameter? I figured out the rest of the parameters. TIA

Europium: epsii= 0.008 solvation parameter = -0.00110

Americium epsii= 0.014 solvation parameter = -0.00110

Abu Turab Naqvi Thnank you