Comparing atomic orbitals in terms of their energy. Explain this in details.

Orbital with different magnetic quantum numbers are degenerate (same energy) in the absence of magnetic and electric fields. Sum of the Principal and Azimuthal quantum number (n + l) determine the energy of the orbitals.

Higher the (n + l) value of the orbital, larger the energy of the orbital. If the orbitals have same (n + l) value, then orbital with higher ‘n’ value, has the higher energy.

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