The decreasing order of the ionization energy (in kJ/mol) of He, Mg – and Na is He > Mg > Na. The increasing order of the 2nd ionization energy (in kJ/mol) of these elements will be Mg - and Na is He > Mg > Na. The increasing order of the 2nd ionization energy (in kJ/mol) of these elements will be The decreasing order of the ionization energy (in kJ/mol) of He November 9, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related