I really like Palladium. It can do so many different reactions it is really impressive! It can also be changed in many different ways to make it do different things and is often used to catalyse reactions!
I wanna say Ruthenium based mostly on the name. But I will have to say Sulphur as I keep ending up using it in my research no matter how much I try to avoid if (a lot of sulphur compounds are very smelly!).
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