(D) According to the $(n + \ell)$ rule,the energy of orbitals increases in the order of their $(n + \ell)$ values. For the $6^{th}$ period,the orbital

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(D) According to the $(n + \ell)$ rule,the energy of orbitals increases in the order of their $(n + \ell)$ values. For the $6^{th}$ period,the orbitals filled are $6s$ $(n+\ell = 6+0=6)$,$4f$ $(n+\ell = 4+3=7)$,$5d$ $(n+\ell = 5+2=7)$,and $6p$ $(n+\ell = 6+1=7)$.Thus,the correct order of filling is $6s, 4f, 5d, 6p$.

Class 11 Chemistry Structure of Atom Quantum number, Electronic configuration and Shape of orbitals

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In the sixth period,the orbitals that are filled are

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A
$6s, 5f, 6d, 6p$
B
$6s, 6p, 6d, 6f$
C
$6s, 5d, 5f, 6p$
D
$6s, 4f, 5d, 6p$

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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In the sixth period,the orbitals that are filled are

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