(B) According to the $(n+l)$ rule,electrons fill orbitals in order of increasing $(n+l)$ values.For $n=6$:$6s: n+l = 6+0 = 6$$4f: n+l = 4+3 = 7$$5d: n

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$ns \to (n-2)f \to (n-1)d \to np$

(B) According to the $(n+l)$ rule,electrons fill orbitals in order of increasing $(n+l)$ values.For $n=6$:$6s: n+l = 6+0 = 6$$4f: n+l = 4+3 = 7$$5d: n+l = 5+2 = 7$$6p: n+l = 6+1 = 7$Comparing the orbitals with the same $(n+l)$ value,the one with the lower $n$ value fills first.Thus,the order is $6s \to 4f \to 5d \to 6p$,which corresponds to $ns \to (n-2)f \to (n-1)d \to np$.

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

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If the principal quantum number $n=6,$ the correct sequence of filling of electrons will be

JEE MAIN 2015 All JEE MAIN

A
$ns \to (n-2)f \to np \to (n-1)d$
B
$ns \to (n-2)f \to (n-1)d \to np$
C
$ns \to np \to (n-1)d \to (n-2)f$
D
$ns \to (n-1)d \to (n-2)f \to np$

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Structure of Atom

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Quantum number, Electronic configuration and Shape of orbitals

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Which orbital has two angular nodal planes?

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Which one is a wrong statement?

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The number of unpaired electrons in the ground state of a nickel atom is $(Atomic \ number \ of \ Ni = 28)$.

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What are the four quantum numbers for the valence electron of sodium $(Z = 11)$?

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What would be the electronic configuration of $Cs (Z=55)$ in each case?
$(a)$ If there were three possibilities of the electron spin.
$(b)$ If the quantum number,$l$,could have the value $n$,and if all the rules governing electron configuration were otherwise valid.

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If the principal quantum number $n=6,$ the correct sequence of filling of electrons will be

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Which orbital has two angular nodal planes?

Which one is a wrong statement?

The number of unpaired electrons in the ground state of a nickel atom is $(Atomic \ number \ of \ Ni = 28)$.

What are the four quantum numbers for the valence electron of sodium $(Z = 11)$?

What would be the electronic configuration of $Cs (Z=55)$ in each case?$(a)$ If there were three possibilities of the electron spin.$(b)$ If the quantum number,$l$,could have the value $n$,and if all the rules governing electron configuration were otherwise valid.

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What would be the electronic configuration of $Cs (Z=55)$ in each case?
$(a)$ If there were three possibilities of the electron spin.
$(b)$ If the quantum number,$l$,could have the value $n$,and if all the rules governing electron configuration were otherwise valid.