Which statement is false? A)For any atom,the 4s orbital lies lower in energy than the 5s orbital. B)For a hydrogen atom,a 4s orbital,a 4p orbital,and a 4d orbital all have the same energy. C)The 4s orbital lies lower in energy than the 3d orbital for atoms K,Ca,Sc,and Ti. D)The 4s orbital lies lower in energy than the 3d orbital for Cu and Fe²⁺.

Question

Quizplus · Accepted Answer

In atoms such as copper (Cu) and iron (Fe), the 4s orbital is initially filled before the 3d orbitals during the electron configuration process. However, once the 3d orbitals begin to fill, they actually become lower in energy than the 4s orbital. This is due to electron-electron repulsions and the specific nature of orbital energies in transition metals. Therefore, the statement that the 4s orbital lies lower in energy than the 3d orbital for Cu and Fe is false after the 3d orbitals have started to fill.

Which Statement Is False