For a given value of principal quantum number the order of increasing energy for different subjects is

Answer 1

For a given value of the principal quantum number (n), the order of increasing energy for different subshells is given as:
s < p < d < f

This means that the s-subshell has the lowest energy, followed by p, d, and f subshells in increasing order of energy. This order can also be visualized on the periodic table by the relative positions of these subshells within each block. For example, the s-subshell appears at the beginning of each new period, followed by the p-subshell, then the d-subshell, and finally the f-subshell.