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n = 5. For Be³⁺ (Z=4), r₅ = 25/4 × 5.29×10⁻¹¹ = 3.306×10⁻¹⁰ m.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Developments Leading to Bohr Model - Electromagnetic Radiation and Spectrum
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