This image was copied from en.wikipedia.org. The original description was:
Promethium table image created by <a href="//commons.wikimedia.org/wiki/User:Schneelocke" title="User:Schneelocke">schnee</a> for Wikipedia on <a href="//commons.wikimedia.org/wiki/June_23" title="June 23">June 23</a> <a href="//commons.wikimedia.org/wiki/2003" title="2003">2003</a>, 13:55 UTC.
<a href="//commons.wikimedia.org/wiki/User:Tuvalkin" title="User:Tuvalkin">Ahoerstemeier</a>
CC BY-SA 3.0
<span class="int-own-work" lang="en">Own work</span>