The element that can stay radioactive for millions of years is plutonium. This is where most nuclear power plant energy comes from.
Plutonium is the element named after the planet Pluto. It is a radioactive element with a half-life of thousands of years, not millions.
Probably Plutonium but I do not think it is named after Pluto.
Technetium (Tc) is the element that has no stable isotopes. All of its isotopes are radioactive with half-lives ranging from minutes to millions of years.
That depends on the "half-life" of that particular radioactive element, which the question forgot to state. They're all different. Various radioactive elements have half-lives ranging from microseconds to millions of years.
It is not yet discovered since all of the uranium isotopes are having half life for several millions of years. We would be able to find it after atleast 700 millions of years.
The radioactive element with a half-life of 4.5 billion years is Uranium-238. It is commonly used in radiometric dating to determine the age of rocks and materials on Earth due to its long half-life.
Actually, they are biodegradeable, sort of. Radioactive materials do decay, or become weaker over time. Eventually they become inert, or non-radioactive. The problem is some radioactive isotopes take tens or even hundreds of thousands or millions of years to decay. The decay rate of a radioactive element is measured in half-lives. After one half-life, half of the radioctivity is gone. Take an element with a half-life of ten years. After ten years, there is half of the radioactivity present. After 20 years, one quarter, after 30 years, one eighth, and so forth. Eventually the level will fall to the point it poses no danger. Plutonium-239 has a half-life of 24,000 years. Uranium-235, used in nuclear reactors, has a half-life of 713,000,000 years.
Uranium
berkelium
The answer is Berkelium.
Berkelium
The total production of berkelium, around the world, during the last 60 years, was only some grams.