Hydrogen atoms have only one electron shell.
The number of shells an atom has can be determined by the row (period) on which an atom is found on the periodic table. The start of a new row means the start of a new shell. Since hydrogen is element #1, it has only one proton and electron, is found on the first row, and has only one shell.
The term valence refers specifically to only the outermost shell, so in fact all elements have only one valence shell.