Question

Although the 4s orbitals are occupied before 3d orbitals, yet we cannot say that they (6) are always more stable. Explain with suitable examples.

Answer 1

4s orbitals low energy compare to 3d orbitals . in orbital electron filled by (n+l) rule .
according to (n+l) rule which orbital taking have low energy ,filled firstly .

but sometime also 3d orbitals may be more stable although it's energy high compare to 4s orbitals.

because according to' hund rule ' half filled orbitals are more stable ..

in this cause having high energy orbitals more stable compare to low having low energy orbitals .

for example

4p³ orbital is more stable compare to 3d² orbital .


hope it can help you ..,,,,✌✌