What is ratio of time periods (T1 /T 2 ) in second orbit of hydrogen atom to third orbit of He+ ion? What is ratio of time periods (T1 /T 2 ) in second orbit of hydrogen atom to third orbit of He+ ion? November 10, 2020 Category: Chapter 2 - Atomic Structure (Level 1 and Level 2) , N Awasthi Physical Chemistry , Facebook Messenger WhatsApp Share this:TwitterFacebook Related