In atoms having more than one electron,electrons can only make transitions for which the l quantum number changes by one unit.

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This statement is true according to the selection rules for electronic transitions in multi-electron atoms, known as the Laporte rule. It states that transitions between energy levels in atoms require a change in the quantum number of angular momentum, Δl = ±1. This is because the probability of electron density is zero at the nucleus for the s orbital (l=0), and minimum at r = a0 for p orbitals (l=1), and so on. Thus, any transition between orbitals of different angular momentum quantum number requires a change in the electron's position and thus energy must be absorbed or emitted.

In Atoms Having More Than One Electron,electrons Can Only Make