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A radioactive element is the element which radiates continuously giving alpha, beta, and gamma rays. The elements having atomic no. more than 82 are mostly considered as radioactive elements. These elements emit radiations by themselves even if if they are not get touched. They are discovered by Maria Curie and Pierre Curie in 1907

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mariamnadeem

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2y ago
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11y ago

A radioactive element is an element subject to spontaneous degeneration of its nucleus accompanied by the emission of alpha particles, beta particles, or gamma rays. All elements with atomic numbers greater than 83 are radioactive. Naturally occurring radioactive elements include radium, thorium, and uranium. Several radioactive elements not found in nature have been produced by the bombardment of stable elements with subatomic particles in a cyclotron. (The Free Dictionary.com)

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13y ago

A radioactive element is an element with an unstable nucleus, which radiates alpha, beta or gamma radiation and gets converted to a stable element

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10y ago

radioactive isotopes are isotopes with irregular nuclear composition, it emits energy due to decay of atomic nucleus.

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11y ago

Now are known 118 elements, stable or radioactive; in the future only radioactive elements will be possible to be prepared.

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13y ago

radon, radium and uranium

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Q: What is unknown radioactive elements?
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Related questions

Could there be a more elements that are unknown in the periodic table?

sure, but all will be radioactive with short halflives.


Why did Marie Curie discover polonium and radium?

Studying residues of uranium ores, Marie Curie and Pierre Curie found that these residues are more radioactive than uranium; they attributed this radioactivity to unknown elements. They isolated these elements and named these elements polonium and radium.


Radioactive elements comprise a majority?

Yes. Stable elements are 83 elements. all elements above that of atomic number 83 (Bismuth) are radioactive. Radioactive isotopes are of the order of 1500 radioactive isotope.


Do trace elements have to be radioactive?

No, trace elements are not necessarily radioactive. A link to a list of elements that have no natural radioactive isotopes is at a related question, below.


What made up all radioactive elements?

After disintegration all radioactive elements are transformed in other elements.


Are all transition elements are radioactive?

Not all of the transition elements are radioactive. Many of them are, and some of them have common radioactive isotopes, but some of them have no naturally occurring radioactive isotopes. Please note that all elements have synthetic radioactive isotopes, at least.


The pressure and heat that produces magma are caused in part by?

Radioactive elements


What families have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


What did Marie Curie discover about radium and polonium?

Marie and Pierre Curie discovered that polonium and radium are natural radioactive chemical elements. Studying residues of uranium ores Marie Curie and Pierre Curie found that these residues are more radioactive than uranium; they attributed this radioactivity to unknown elements. They isolated these elements and named these elements polonium and radium.


How did Marie Curie find out polonium?

Studying residues of uranium ores Marie Curie found that these residues are more radioactive than uranium; she attributed this radioactivity to unknown elements. She isolated these elements and named these elements polonium and radium.


What element family have no radioactive elements?

Radioactive elements exist in all groups of the periodic table.


What elements are radioactive?

Answerelements with a nonstable isotope or at least one naturally occurring isotope that is radioactive. AnswerAll elements have radioactive isotopes.There are a lot of radioactive elements: Technetium, Promethium, Polonium, Astatine, Radon, Francium...Here is the whole list: http://periodictable.com/Elements/Radioactive