Electromagnetic radiations of wavelength 240 nm are just sufficient to ionize sodium atom. The ioniz — Atomic Structure Chemistry Question

💡 Solution & Explanation

E = h*c/λ = (6.626 * 10^-34 * 3 * 10^8) / (240 * 10^-9) = 8.2825 * 10^-19 J. I.E. = E * N_A = 8.2825 * 10^-19 * 6.022 * 10^23 = 4.987 * 10^5 J/mol = 498.58 kJ/mol.