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Increasing order of energies of subshells or orbitals or electrons in an atom can be obtained by using ‘n + l’ rule given by

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An Intiative by Sri Chaitanya

Bohr and Bury

Hund

Pauli

Aufbau

answer is A.

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Detailed Solution

It should be noted that ‘Aufbau’ is a German term meaning building up.

Aufbau principle was proposed by Niels Bohr.

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