Practice question

MCQ

Question

An electron in Li²⁺ is in the n = 2 state. What is its energy in joules? (E₁ for H = -2.18 × 10⁻¹⁸ J)

Options

Choose one · Correct answer highlighted

-4.905 × 10⁻¹⁸ J Correct -2.18 × 10⁻¹⁸ J -1.962 × 10⁻¹⁷ J -5.45 × 10⁻¹⁹ J

Explanation

E₂ = -9 × 2.18×10⁻¹⁸ / 4 = -4.905×10⁻¹⁸ J.

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