The property of a 2-dimensional 2-electron quantum dot(QD) subjected to an external magnetic field B and affected by a charged impurity is studied.The impurity is located at the z-axis by a distance d from the plane of the dot.The energy spectra of low-lying state of the QD are obtained by the exact diagonalization approach.The evolution of the angular momentum L0 and the spin S0 of the ground state in accord with B and d has been calculated,the results are summarized and plotted in a(L0,S0) diagram.The(L0,...