Question

Which metal is non radioactive

Answer 1

All isotopes of all the elements heavier than lead on the periodic table are radioactive.  That includes:
Bismuth
Polonium
Astatine
Radon
Francium
Radium
Actinium
Thorium
Protactinium
Uranium
Neptunium
Plutonium
Americium
Curium
Berkelium
Californium
Einsteinium
Fermium
Mendelevium
Nobelium
Lawrencium
Rutherfordium
Dubnium
Seaborgium
Bohrium
Hassium
Meitnerium
Darmstadtium
Roentgenium
Copernicium
Flerovium
Livermorium

There are no stable isotopes of technetium or promethium.

That makes 34 named elements with no stable isotopes.

All elements have isotopes that are radioactive, but few of them have half lives long enough to find in nature. Carbon-14, Hydrogen-3, and Potassium-40, are naturally occurring and abundant.