Practice question
Question
The radius of the first orbit of Li²⁺ is 1.763 × 10⁻¹¹ m. What is the kinetic energy of an electron in the third orbit? (v₁ for H = 2.19 × 10⁶ m s⁻¹, mₑ = 9.1 × 10⁻³¹ kg)
Explanation
v₃ = 2.19×10⁶ m s⁻¹. KE = ½mv² = 2.18×10⁻¹⁸ J.
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