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NEET2025ChemistryStructure of AtomActual

Energy and radius of first Bohr orbit of He ⁺ and Li ²⁺ are [Given R _ H =2.18 10⁻¹⁸ ~J , a ₀=52.9 pm ]

Options

  1. Aaligned & E _ n ( Li ²⁺ )=-19.62 10⁻¹⁸ ~J ; & r _ n ( Li ²⁺ )=17.6 pm & E _ n ( He ⁺ )=-8.72 10⁻¹⁸ ~J ; & r _
  2. Baligned & E _ n ( Li ²⁺ )=-8.72 10⁻¹⁸ ~J & r _ n ( Li ²⁺ )=26.4 pm & E _ n ( He ⁺ )=-19.62 10⁻¹⁸ ~J ; & r _ n
  3. Caligned & E _ n ( Li ²⁺ )=-19.62 10⁻¹⁶ ~J & r _ n ( Li ²⁺ )=17.6 pm & E _ n ( He ⁺ )=-8.72 10⁻¹⁶ ~J & r _ n (
  4. Daligned & E _ n ( Li ²⁺ )=-8.72 10⁻¹⁶ ~J & r _ n ( Li ²⁺ )=17.6 pm & E _ n ( He ⁺ )=-19.62 10⁻¹⁶ ~J ; & r _ n

Correct answer

A. aligned & E _ n ( Li ²⁺ )=-19.62 10⁻¹⁸ ~J ; & r _ n ( Li ²⁺ )=17.6 pm & E _ n ( He ⁺ )=-8.72 10⁻¹⁸ ~J ; & r _

Step-by-step solution

aligned & E_n=-2.18 10⁻¹⁸ Z^2 n^2 J & For He ⁺ E ₁=-2.18 10⁻¹⁸ 2^2 1^2 ~J & =-8.72 10⁻¹⁸ ~J & For Li ²⁺ E ₁=-2.18 10⁻¹⁸ 3^2 1^2 ~J & =-19.62 10⁻¹⁸ ~J & r _ n =52.9 n ^2 Z pm & For He ⁺ r ₁=52.9 1^2 2 pm =26.4 pm & For Li ²⁺ r ₁=52.9 1^2 3 pm =17.6 pm aligned

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