Question

9. The Sub shell electronic configuration of an element is given in two ways
i) 1s 2s 2p 3s 3p 3d 4sa
i) 1s 2s 2p 3s 3p 3ď® 4s"
Which among these is the correct electronic configuration? Give reason?​

Answer 1

Answer:

both r wrong

Explanation:

1s 2s 2p 3s 3p 4s after 3d will come

Answer 2

Answer:

the electron first enters in to 4s than in 3d because 4s orbital has lower energy to than 3d

AFBAU PRINCIPLE : Lower energy orbitals are filled first