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What element is radioactive?

In: Chemistry, History of Science [Edit categories]

Answer:

radon, radium and uranium

First answer by Grantal. Last edit by Grantal. Contributor trust: 1 [recommend contributor ]. Question popularity: 14 [recommend question].

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Why are radioactive elements called 'radioactive'?
Radioactive means unstable, so any element that has an unstable nucleus is radioactive. This is especially true of element's isotopes.
What element is a radioactive element?
What element is a radioactive element?
How is a radioactive element different from a element?
A radioactive element is simply an element that emits radiation due to instability in it's nucleus. All elements have radioactive isotopes. Tritium is hydrogen-3, which is radioactive and is...
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All elements after lead (Pb) on the periodic table are radioactive. Isotopes of lighter elements (C-14 for example) can be radioactive as well. And, in fact, all elements have radioactive isotopes.
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There are actually quite a few radioactive elements. As a rule, everything with an atomic mass greater than lead is radioactive. Isotopes of lighter elements can also be radioactive. All...