Which are radioactive elements in periodic table?

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Not all elements are radioactive. Only elements having atomic number more than 83 are considered having radioactive nature (radio-isotopes). The elements with atomic number less than 83 are considered stable.

OLDER ANSWER:Theoretically they all are, it is just a matter of decay-speed(radioactivity).
In general, the elements with higher numbers (more protons and neutrons) are more unstable, and thus decay faster.
26 Iron is considered stable, but higher then 84 Polonium is considered active.
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What is a period on the periodic table of elements?

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What is the last element in the periodic table that is not radioactive?

We're not actually 100% certain that there are any elements that are absolutely not radioactive. Some Grand Unified Theories predict that protons are unstable over incredibly long timescales, and if so, no baryonic matter (all elements are baryonic matter) is stable over the very very long term. (MORE)

Why is the table of elements named the periodic table?

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What are radioactive elements that are on the periodic table of elements?

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Elements on the periodic table of elements?

total no of elements in periodic table is 112.Some of which are still unnamed. Elements on the periodic table is classifies into metals, non-metals, semiconductors, and elements that are radioactive. Elements are arranged in increasing order of their atomic number. In a periodic table on the left (MORE)

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How do elements get into the periodic table of elements?

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On the Periodic Table of elements What is a period?

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Who thought of the periodic table of elements?

Many people thought of the idea, but we have given credit toDmitri Mendeleev in 1869. I think its because he took the ideafurther and inscribed detail into his table, even predicting futureelements. However, Lothar Meyer has also produced a similar versionat essentially the same time as Dmitri Mende (MORE)

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Why does a periodic table of elements have symbols?

The same reason anything else uses symbols: to represent information in a condensed form. Element symbols take up much less space than the full name of the element, and so can be written in a large font to make them easy to see at a glance. The full name is generally written in a much smaller font. (MORE)

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Everything on The Periodic Table is an element, hence the the name PERIODIC TABLE OF ELEMENTS - - - - - Well...the paper the table is printed on and the ink used to print it with are not elements, but everything else is.

The elements in the periodic tables?

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What does the elements mean on the periodic table?

Kr= krypton hope that helps you guys out who aren't as smart as some others with this type of science elements periodic table, I'm not the smartest person in science but at least i knew this really easy answer :P what the hello dude that's not it /!!?!

What are the radioactive element in the periodic table?

This is hard to answer. All elements have radioactive isotopes. Some elements have no known stable isotopes. It might be more instructive to put the periodic table aside and look at a table of nuclides instead. There's a link to one in the Related Links section.

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A normal periodic table does not list isotopes, but elements, almost all of which occur in more than one isotope, and there is probably at least one radioactive isotope for every element. Instead of the periodic table, a table of nuclides is needed to answer this question.

What are the most radioactive elements in the periodic table?

Elements of the lanthanide and actinide series are the most radioactive. These include many elements that have such short half lives that they are never observed outside the laboratory (and are observed with great difficulty even within the laboratory). Some elements can only exist for a fraction of (MORE)

Why the table if the elements called a periodic table?

Because in the table the elements are arranged into "periods",elements belonging to the same period have similarphysical/chemical properties. This in tern reflects the fact thatthey have a similar number of outer shell electrons.