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G-block

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[?]).

Other blocks:

p-block
s-block
f-block
d-block

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