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JEE Main202522 Jan 2025Morning ShiftChemistryStructure of AtomActual

Radius of the first excited state of Helium ion is given as : a ₀ radius of first stationary state of hydrogen atom.

Options

  1. Ar =4 a ₀
  2. Br =2 a ₀
  3. Cr= a₀ 2
  4. Dr= a₀ 4

Correct answer

B. r =2 a ₀

Step-by-step solution

aligned & r = a ₀ ( n ^2 z ) & r = a ₀(2)^2 (2) & r =2 a ₀ aligned

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