Question

In which of the following aufbau principle is violated?
1) ls 2s 2p 3s 3p!
2) 1s 2s 2p 3s 3p 4s!
3) Is’2s 2p 3s 3p 4s'34'
4) 1s 2s 2p 3s 3p 3d​

Answer 1

Answer:

In option 4, it us violated