Among Radium, Plutonium, Zirconium and Uranium, which elements are not radio-active?
List of Radioactive elements- Technetium, Promethium, 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, Nithnium, Flerovium, Moscovium, Livermorium, Tennessine, Organesson.
