1S22S22P63S23P64S23D104P6. Bromine atom electron configuration (bohr model) therefore, the bromine atom will have two electrons in the first shell, eight in the 2nd orbit, eighteen electrons in the 3rd shell, and the. 1s 2 2s 2 2p 6 3s 2 3p. Identify the element represented by this electron configuration. To find the number of unpaired …