Are these gummy worms? (don't ask why the render is so crisp)

The humble oganesson

The humble SIZE OF THE UNIVERSE:

It doesn't occur naturally and only 3 atoms have ever been made in a lab

And they decayed almost instantly

In that case it's not meant to be a material

Why

Cuz who would wanna build with that

What do you count as a material

Stuff you could build with

So do you count uranium as a material

Yes

So why is uranium a material but oganesson isn't

You can build using uranium

Who says you couldn't build with oganesson if you had enough of it

It would be too unstable

You couldn't sit on it

So your threshold for being a material is being able to sit on it

Yes

Astatine.
THIS is the rarest thing.

Wood is only found on earth

What about bones

That's also pretty rare