What is the difference between a 1s orbital and a 2s orbital?

Electrons populate atomic orbitals, starting from the lower energy sublevel. This is the minimum energy rule. The sequence in the growth of the energy of the sublevels is as follows: 1s <2s <2p <3s <3p <4s ≤ 3d <4p <5s, etc.
What is the difference between the 1s orbital and the 2s orbital?
The radius of the 1s orbital is smaller than the radius of the 2s orbital. The energy of electrons in the 2s orbital is greater than the energy of electrons in the 1s orbital.



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