The following is the extended periodic table containing 256 elements (for comparison the standard periodic table contains 118 elements). Only 118 elements have been observed and officially named. Elements with atomic numbers 119 to 256 are not [officially] named until they are discovered, but right now they use placeholder names. On this page though, the periodic table displays provisional names for these undiscovered elements, all after prominent scientists (especially chemists and physicists). It is updated as of 11 March 2017.
The periodic table below contains five blocks, 82 families and 31 series. The only g-block series is shown below the main table. However the last possible element with atomic number 173, ultimium (Ul), which would be only element of the second g-block series below lavoisium, is not shown on the periodic table for a convenience reason.