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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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By Expert Faculty of Sri Chaitanya
a
Bohr and Bury
b
Hund
c
Pauli
d
Aufbau

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detailed solution

Correct option is A

It should be noted that ‘Aufbau’ is a German term meaning building up.Aufbau principle was proposed by Niels Bohr.
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