Question

Out of 3d and 4s, whose energy is more ?

Answer 1

Answer:

4s orbitals are lower in energy than 3d orbitals and so electrons fill up in 4s before filling up in 3d. Explain: ... Therefore , 3d orbital is higher in energy than 4s . And hence electrons fill up in 4s before filling up in 3d .

Answer 2

4 s orbital has more energy than the other one