<html><head></head><body><div class="yahoo-style-wrap" style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div dir="ltr" data-setdir="false">Dear Sir/Madam,</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">I want to study how the bond population (covalent vs. ionic ratio) and bond strength changes when we substitute an atom with another. As I am new to QE, I am not very aware of most of the modules available with it. Please let me know what is the procedure for this.</div><div dir="ltr" data-setdir="false"><br></div><div dir="ltr" data-setdir="false">Regards</div><div dir="ltr" data-setdir="false">Akhil</div><div dir="ltr" data-setdir="false">HBNI, India</div></div></body></html>