The general electronic configuration of chlorine is \\\\([Ne] 3s^{2} 3p^{5}\\\\).When electrons are excited in chlorine, the electrons enter into 3d subshell then the electronic configuration of chlorine is given as:\\\\([Ne] 3s^{1} 3p^{3} 3d^{3}\\\\)Thus the number of unpaired electrons will be 7.