Treballs Finals de Grau de Física, Facultat de Física, Universitat de Barcelona, Curs: 2021, Tutor: José M. Fernández-VareaIn this work the energies and wave functions of 2-electron atoms have been studied. To this end, the Hartree–Fock self-consistent method has been applied to explore the isoelectronic series of He in the ground state. The bulk of the work has consisted in writing a program, based on the Numerov–Cooley method, to solve the radial Schr¨odinger equation. The final results are discussed and compared to reference value