Four New Elements » 700px-Periodic_Table_Radioactivity.svg

Periodic table with elements colored according to the half-life of their most stable isotope.
Stable elements: Elements which contain at least one stable isotope;
Slightly radioactive elements: the most stable isotope is very long-lived, with half-life of over two million years;
Moderately radioactive elements: the most stable isotope has half-life between 800 and 34,000 years;
Highly radioactive elements: the most stable isotope has half-life between one day and 103 years;
Significantly radioactive elements: the most stable isotope has half-life between one minute and one day;
Extremely radioactive elements: the most stable isotope has half-life less than a minute. Very little is known about these elements due to their extreme instability and radioactivity.

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