1s orbital and 2s orbital whose similarity and dissimilarity behaviours should be identified
For any value of the principal quantum number (n), the angular momentum quantum number (l) has the value of 0 corresponding to an s subshell. When l = 0, the magnetic quantum number (ml) has only one possible value 0 corresponding to an s orbital. Therefore, there is an s subshell in every shell and each s subshell contains one orbital, an s orbital. All s orbitals are spherical in shape but differ in size, which increases as the principal quantum number increases.