Four different sets of quantum numbers for 4 electrons are given below:-

What is the order of energy fore₁,e₂,e₃ande₄? Explain.

e₃ > e₁ > e₂ > e₄

Energy depends on the value of n and l by the Bohr' Bury rule.
Higher value of n+l will have higher energy. If value of n+l is same, then higher value of n will have higher energy

For e₁, n+l = 4 + 0 = 4
For e₂, n+l = 3+ 1 = 4
For e₃, n+l = 3 + 2 = 5
For e₄, n+l = 3 + 0 = 3