How high of atomic number to get g-block electrons?

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SUMMARY

The discussion centers on the potential discovery of Element 121 and its implications for the Periodic Table, specifically regarding the introduction of g-block electrons. Element 118, Oganesson (Og), has been confirmed, and the addition of Element 121 is anticipated to create a new g-block section, similar to the f-block for rare earth elements. While the extrapolation of g-block elements is plausible, complexities may arise that could affect this outcome. Current calculations on the first g-block elements are expected to be reliable.

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swampwiz
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I have just read that Element 118, Og, has been discovered, which it would seem will allow for a nice, neat Periodic Table again, last seen when Lw (103) was added (although that should be in Group III, but whatever, it was a nice, neat table). It seems to me that once Element 121 gets discovered, there will finally be an atom that has a g-block electron. Is this accurate? Will the Periodic Table have to start a new g-block section in a similar way that the rare Earth's represented the f-block?
 
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swampwiz said:
It seems to me that once Element 121 gets discovered, there will finally be an atom that has a g-block electron. Is this accurate?

We don't know. It's a natural extrapolation, but there appear to be plenty of complexities that could spoil it. This Wikipedia article provides a decent overview:

https://en.wikipedia.org/wiki/Extended_periodic_table
 
I would expect the current calculations on the first g block elements to be quite accurate.
 

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