> Thanks for this information.
>
> I wonder, if we still will find more elements, especially the heavier
> ones. Or if we learn, to create ultra-heavy elements by our own somewhen
> in the future, thanks to our continuous learning about new cosmic
> building blocks (like quarks, black matter, etc.).

Maybe that so called "dark matter" is realy just a huge quantity of free 
neutrons.
After all, "dark matter" is regarded as been non interacting with light, 
having a mass, and only interact with normal matter gravitationaly. The 
neutron nicely fit the bill.

>
> Maybe, one day we can even construct exotic elements that have a
> negative gravity.

That mean a negative MASS and ENERGY!
That's the stuff of fiction.

>
> I think, I should go a little bit deeper into this science. Interesting
> enough.
>

If you think about stable elements, no unless there is a catastrophic 
break through.
More elements? Yes. But, most will exist only as single atoms for less 
than a micro second, 0.000001 second, before they spontaneously 
desintegrate.

The heaviest element discovered to date is:
Ununoctium 	symbole: Uuo	 atomic number: 118 and it's most stable 
isotope have 294 nucleotides. It's half life is estimated to be less 
than a nano-second...
It /could/ be a noble gas following the radon, but is yet to be 
classified into any family.


Alain

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