Consider an electrically neutral iron atom whose atomic numb

Consider an electrically neutral iron atom, whose atomic number is 26. If one electron is knocked out from the L shell of an iron atom, leaving behind a vacancy, or hole, from what energy shells can an electron make a transition to fill the hole and emit an L X ray? the K shell the L shell the M shell the N shell

Solution

One electon from outer shell makes transition to fill the vacancy electron. Therefore answer is M shell.