Correct order of energy in the given subshells is:

Explanation

The order of energy in subshells is based on the principal quantum number (n) and the angular momentum quantum number (l). The principal quantum number determines the size of the orbital, while the angular momentum quantum number determines the shape of the orbital. The order of energy in subshells is as follows: s subshell (l = 0) p subshell (l = 1) d subshell (l = 2) f subshell (l = 3) The orbitals are organized in such a way that the lower principal quantum numbers (n) have lower energy, and within a given n, the subshells follow the order s < p < d < f. The s subshell has the lowest energy, followed by the p subshell, the d subshell, and so on. This is because the s subshell has the lowest angular momentum, and the angular momentum determines the energy of the orbital. The correct order is: 1s < 2s < 2p < 3s < 3p < 4s < 3d < 4p < 5s < 4d < 5p < 6s...