Consider the ground state of Cr atom \left ( Z=24 \right ).The numbers of electrons with the azimuthal quantum numbers l= 1\: and\: 2 are, respectively

  • Option 1)

    12 \: and \: 4

  • Option 2)

    12 \: and \: 5

  • Option 3)

    16 \: and \: 4

  • Option 4)

    16 \: and \: 5

 

Answers (2)

As we learnt in 

Azimuthal Quantum Number(l) -

For a given value of n, l can have n values ranging from 0 to n – 1, that is, for a given value of n, the possible value of l are : l = 0, 1, 2, ....( n –1)

-

_{24}Cr\rightarrow 1s^{2}\: 2s^{2}\: 2p^{6}\: 3s^{2}\: 3p^{6}\: 3d^{5}\: 4s^{1}

we know for p,l=1\: and \: for\: d,l= 2

F\! or\; l=1,total\: number\: of \: electrons \: = 12\: \: \left [ 2p^{6}\ and\ 3p^{6} \right ]

F\! or\; l=2,total\: number\: of \: electrons \: = 5\: \: \left [ 3d^{5} \right ]

 


Option 1)

12 \: and \: 4

Incorrect option

Option 2)

12 \: and \: 5

Correct option

Option 3)

16 \: and \: 4

Incorrect option

Option 4)

16 \: and \: 5

Incorrect option

N neha

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