JEE Advanced 2024 Paper 2 Q01 Chemistry Physical Chemistry Atomic Structure Easy

JEE Advanced 2024 Paper 2 · Q01 · Atomic Structure

According to Bohr's model, the highest kinetic energy is associated with the electron in the

  1. A. first orbit of H atom
  2. B. first orbit of $He^+$
  3. C. second orbit of $He^+$
  4. D. second orbit of $Li^{2+}$
Reveal answer + step-by-step solution

Correct answer:B

Solution

In Bohr's model the kinetic energy of an electron is $K.E. = 13.6\,\frac{Z^2}{n^2}$ eV. (A) $Z=1, n=1\Rightarrow 13.6$ eV. (B) $Z=2, n=1 \Rightarrow 54.4$ eV. (C) $Z=2, n=2 \Rightarrow 13.6$ eV. (D) $Z=3, n=2 \Rightarrow 30.6$ eV. Highest is (B), the first orbit of $He^+$.

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