15. The total energy of revolving electron in an atom A.Cannot be negative B.Can have any value above zero C.Can never be positive D.Will always be positive
Answer: Option C Solution: The total energy of a revolving electron in any orbit is the sum of its kinetic and potential energies. Energy of an electron at infinite distance from the nucleus is zero. As an electron approaches the nucleus, the electron attraction increases and the energy of electron decreases and thus becomes negative. Thus, it can never be positive.
