For the energy levels in an atom, which one of the following statements is correct:
(1) There are seven principal electron energy levels
(2) The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons
(3) The energy level can have maximum of 32 electrons
(4) The sub-energy level is at a higher energy than the sub-energy level
Ans: The second principal energy level can have four sub-energy levels and contains a maximum of eight electrons