G-block

Elemental Groups

d-block
f-block
g-block
p-block
s-block
Subgroups

The G-block elements represent a hypothetical not-yet-observed group of elements beyond the currently-discovered transuranics in which a new electron shell orbital is occupied.

It is not yet known exactly where block G elements will begin on the periodic table; some predict block G will start at element 121 (Unbiunium), others 122 (Unbibium).