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Structure of Atom question

2021 · 26 Feb · Shift 1 · Q15
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Structure of Atom question

2021 · 26 Feb · Shift 1 · Q15

JEE MainChemistryStructure of AtomMCQ+4 / −1
The orbital having two radial as well as two angular nodes is :
  1. A
    3p
  2. B
    5d
  3. C
    4d
  4. D
    4f
View written solutionFree

Correct answer: B

  1. Use the formulas for nodes

For an orbital with principal quantum number nnn and azimuthal quantum number lll:

  • Angular nodes =l= l=l
  • Radial nodes =n−l−1= n - l - 1=n−l−1

We need an orbital having:

  • 222 angular nodes
  • 222 radial nodes

  1. Find the required quantum numbers

Since angular nodes =l=2= l = 2=l=2, the orbital must be a ddd-orbital.

Now radial nodes should also be 222:

n−l−1=2n - l - 1 = 2n−l−1=2

Substitute l=2l=2l=2:

n−2−1=2n - 2 - 1 = 2n−2−1=2 n−3=2n - 3 = 2n−3=2 n=5n = 5n=5

So the orbital is 5d5d5d.


  1. Check each option

A: 3p3p3p

For ppp orbital, l=1l=1l=1.

  • Angular nodes =1=1=1
  • Radial nodes =3−1−1=1= 3-1-1=1=3−1−1=1

So 3p3p3p has 1 radial and 1 angular node. Not correct.

B: 5d5d5d

For ddd orbital, l=2l=2l=2.

  • Angular nodes =2=2=2
  • Radial nodes =5−2−1=2= 5-2-1=2=5−2−1=2

So 5d5d5d has 2 radial and 2 angular nodes. Correct.

C: 4d4d4d

For ddd orbital, l=2l=2l=2.

  • Angular nodes =2=2=2
  • Radial nodes =4−2−1=1= 4-2-1=1=4−2−1=1

So 4d4d4d has 1 radial and 2 angular nodes. Not correct.

D: 4f4f4f

For fff orbital, l=3l=3l=3.

  • Angular nodes =3=3=3
  • Radial nodes =4−3−1=0= 4-3-1=0=4−3−1=0

So 4f4f4f has 0 radial and 3 angular nodes. Not correct.


  1. Final answer

The orbital having two radial as well as two angular nodes is:

5d\boxed{5d}5d​

So, Option B is correct.

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