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JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Atomic Structure

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Figure 1. electron probability density for 2s orbital

Figure 2. wave function for 2s orbital

Which of the following point in Figure 2 most accurately represents the nodal surface as shown in Figure 1?
Structure Figure 1
Figure 1
Structure Figure 2
Figure 2
  1. (A)B✓ Correct
  2. (B)D
  3. (C)C
  4. (D)A

Answer: (A)

Solution

A spherical (radial) node is the surface where the radial wave function passes through zero, , so the electron probability density is zero there as well. In the plot of against distance the curve starts positive near the nucleus and then cuts the axis before dipping negative; the point where it crosses zero is point B. Point B represents the nodal surface.

JEE Main · 2026 · 28 Jan 2026 · Shift 1 · Single correct option

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