View source for Promethium

'''Promethium''' is a synthetic radioactive [[chemical]] [[Chemical element|element]] that has the symbol Pm on the [[periodic table]]. It has the atomic number 61 which means it has 61 [[proton]]s in its [[atom]]. It is the only synthetic element in the [[Lanthanide]] group as all its [[isotope]]s are [[radioactive decay|radioactive]]. Together with [[Technetium]], these are the only two radioactive elements below [[lead]]. Most Promethium is artificially produced. The longest-living  isotope of promethium is <sup>145</sup>Pm, with a [[Half-life (element)|half-life]] of 17.7 years.
== Uses ==
Promethium is used in the illuminated digits of some clocks, its [[Beta Radiation]] may be used to measure thickness.

== Promethium Media ==
<gallery widths='160px' heights='100%' mode='traditional' caption=''>
File:Promethium-147 solution.jpg|Solution containing Pm3+ ions

File:Pitchblende schlema-alberoda.JPG|[[Uraninite]], a uranium ore and the host for most of Earth's promethium

File:Jacob A Marinsky.jpg|Jacob A. Marinsky

File:Larry E Glendenin.jpg|Larry E. Glendenin

File:Charles D. Coryell M.I.T. May 1947.png|Charles D. Coryell M.I.T. May 1947
</gallery>
== Related pages ==
* [[Periodic table]]
* [[List of common elements]]

{{Periodic Table}}


{{chem-stub}}

[[Category:Lanthanides]]
[[Category:Synthetic elements]]

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