engineering physics MCQ #477

The radius of the nth orbit of hydrogen-like atom is given by rn = n² × 0.53 / Z Å. What is the radius of the 3rd orbit of Li²⁺?

engineering physics MCQ #477

  1. Question 1

    Q1. The radius of the nth orbit of hydrogen-like atom is given by rn = n² × 0.53 / Z Å. What is the radius of the 3rd orbit of Li²⁺?

    • A) 0.53 Å
    • B) 1.59 Å
    • C) 1.06 Å
    • D) 0.265 Å

    Answer: 1.06 Å

    Explanation: Substitute n = 3, Z = 3 in rn = n² × 0.53 / Z Å to get r3 = 9 × 0.53 / 3 = 1.59 Å.