Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R) The path of an electron in an atom is clearly defined. Assertion (A) It is impossible to determine the exact position and exact momentum of an electron simultaneously. Reason (R) The path of an electron in an atom is clearly defined. November 12, 2020 Category: Chapter 2 - Atomic Structure , Chemistry , NCERT Exemplar Class 11 , Facebook Messenger WhatsApp Share this:TwitterFacebook Related