Practice question

MCQ

Question

An electron in Be³⁺ has an angular momentum of 6.33 × 10⁻³⁴ J s. What is its energy? (h = 6.626 × 10⁻³⁴ J s, E₁ for H = -2.18 × 10⁻¹⁸ J)

Options

Choose one · Correct answer highlighted

-2.42 × 10⁻¹⁸ J -3.871 × 10⁻¹⁸ J -1.089 × 10⁻¹⁸ J -9.6778 × 10⁻¹⁹ J Correct

Explanation

n=6. For Be³⁺ (Z=4), E₆ = -16×2.18×10⁻¹⁸/36 = -9.678×10⁻¹⁹ J.

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