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In the periodic table, the elements are arranged in the periods following the

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a
Hund's rule of maximum multiplicity
b
Pauli's exclusion principle
c
Aufbau’s principle
d
Both (1) and (2)

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detailed solution

Correct option is C

According to Aufbau’s principle, in the ground state of atom electrons filled up in atomic orbitals of lowest energy levels are available.

Ex: From Moeller’s diagram, 1s < 2s < 2p < 3s....... 

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