Which of the following chemical symbols represents an element that is always radioactive?

Pd - Palladium Pb - Lead (plumbus) Pt - Platinum Pu - Plutonium

Since I was at school 50 years ago, the number of elements in the periodic table has greatly increased...

TestyAlien3443, thanks

Looking forward to watching ‘Radioactive’ 😊 Something to entertain and take my mind off the bizarre life we’re now living 😔✌🏾