Question

Sequence of orbitals in order of their increasing energy

Answer 1

https://chemistry.stackexchange.com/questions/62490/order-of-filling-orbitals-vs-order-of-increasing-energy
Order of Filling Orbitals vs. Order of Increasing Energy ...
https://chemistry.stackexchange.com/questions/62490/order-of-filling-orbitals-vs-order-of-increasing-energy
Order of Filling Orbitals vs. Order of Increasing Energy ...

Answer 2

The order of the electron orbital energy levels, starting from least to greatest, is as follows: 1s, 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, 5p, 6s, 4f, 5d, 6p, 7s, 5f, 6d, 7p