Hydrogen has only one electron in its atomic structure. The hydrogen atom consists of one proton and one electron. In terms of filling electron energy levels, hydrogen has a full outer electron shell when it has two electrons, which can occur when it forms a bond with another atom (like in Hâ‚‚ molecules) or when it participates in chemical reactions, but as a standalone atom, it can only hold one electron.
In a balanced scenario, such as when hydrogen forms a covalent bond, it seeks to achieve a duet (a stable electron configuration) by sharing or acquiring one more electron. However, in its pure atomic form, hydrogen only has one electron and is not "full" in the sense of larger atoms with full outer shells (like the noble gases with complete valence shells).