If the 1st ionization energy of H atom is atom 13..6 eV , then the 2nd ionization energy of He atom is If the 1st ionization energy of H atom is atom 13..6 eV then the 2nd ionization energy of He atom is November 27, 2020 Category: Uncategorised (JEE Advanced Physics by BM Sharma + GMP Solutions) , Facebook Messenger WhatsApp Share this:TwitterFacebook Related