The electron configuration is the arrangement of electrons of an atom, molecule... It concerns the way electrons can be distributed in the orbitals of the given system. The ground state of an electron refers to the lowest electrical state. The following table shows all of the elements electron configurations:

As you can see the ground state electron configurations for each element are given above the written name (bottom of each box)

For example: Magnesium has the configuration of [Ne]3s2; aka 1s2 2s2 2p6 3s2