1. The problem statement, all variables and given/known data By using the Bohr model of the atom: whats the lowest energy transition from the n=2 to n=1 state in Hydrogen (Z=1) 2. Relevant equations En = -13.6eV*Z2/n2 3. The attempt at a solution En = -13.6eV*Z2/n2 n=2 -> n=1 for hydrogen (Z=1) E2= -13.6eV*12/22 =-3.4 eV E1= -13.6eV*12/12 = -13.6 eV deltaE = x1 – x2 = -3.4 + 13.5 = 10.2 eV So 10.2 eV is the lowest energy transition from n2 to n1 right? Does the constant change with elements?