De or het reactorcentrum?

The correct Dutch article is:

het reactorcentrum

Rule Words ending in -um and -ium: usually het. See the rule

How to use reactorcentrum

the reactorcentrumhet reactorcentrum
this reactorcentrumdit reactorcentrum
that reactorcentrumdat reactorcentrum
our reactorcentrumons reactorcentrum
your reactorcentrumjouw reactorcentrum
every reactorcentrumelk reactorcentrum
which reactorcentrum?welk reactorcentrum?
a big reactorcentrum / the big reactorcentrumeen groot reactorcentrum, het grote reactorcentrum