An electron in Li²⁺ has a de Broglie wavelength of 2.21 × 10⁻¹⁰ m in the second orbit. What is its kinetic energy? (h =
v = h/(mλ). KE = ½mv² = 4.936×10⁻¹⁸ J.
Ref: NCERT Class 11 Chemistry > Chapter 2: Structure of Atom > Topic: Quantum Mechanical Model - de Broglie Heisenberg and Schrodinger