No rule for this one
No ending or word group predicts the article of Hals. Learn it as a pair and say it out loud: der Hals.
der Hals
It's der Hals. Hals is masculine, plural die Hälse.
Mein Hals tut weh.
My throat hurts.
No ending or word group predicts the article of Hals. Learn it as a pair and say it out loud: der Hals.