What do you mean, radioactive elements?

Radioactive elements are a kind of elements that can spontaneously release particles or rays from the inner nucleus, and release energy at the same time, and eventually decay into stable elements and stop emitting radiation. This property is called radioactivity, and the process is called radioactive decay.

Radioactive elements can be divided into natural radioactive elements, such as actinium, thorium, uranium, etc., and artificial radioactive elements, such as plutonium, americium, curium, etc. Among them, natural radioactive elements refer to radioactive elements originally found from natural products, including polonium, radon, francium, radium, actinium, thorium, protactinium and uranium. In 1896, the French physicist Becquerel first discovered the radioactivity of uranium. In 1898, the Curie couple conducted a general survey of known elements by means of quantitative measurement of radioactivity with their self-made ionization chamber and electrometer, and found that some minerals were more radioactive than pure uranium or pure thorium. From pitchblende they isolated polonium, a new element 400 times more radioactive than uranium. Then, the Curie couple and other from the pitchblende separation of another highly radioactive new element -- radium. In 1899, French scientist de Bierne separated the radioactive element actinium from uranium slag.

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