De or het unbinilium?

The correct Dutch article is:

het unbinilium

Rule Words ending in -um and -ium: usually het. See the rule
Meaning (Dutch) (scheikunde, element) scheikundig element met het symbool Ubn en het atoomnummer 120

How to use unbinilium

the unbiniliumhet unbinilium
this unbiniliumdit unbinilium
that unbiniliumdat unbinilium
our unbiniliumons unbinilium
your unbiniliumjouw unbinilium
every unbiniliumelk unbinilium
which unbinilium?welk unbinilium?
a big unbinilium / the big unbiniliumeen groot unbinilium, het grote unbinilium

Meaning, plural, diminutive, pronunciation and translations: WikiWoordenboek (Dutch Wiktionary) (CC BY-SA 4.0). Example sentences: Tatoeba (CC BY 2.0 FR).