"20 most important elements" by Brayan Andrade https://padlet.com/301200/ivw6306p2i4k en-us 2017-04-26 21:28:58 UTC 2023-05-25 05:15:54 UTC hello@padlet.com Actinium 301200 https://padlet.com/301200/ivw6306p2i4k/wish/168506747 symbol ac
Atomic number
important fact Actinium is found naturally in uranium ores such as pitchblende (mostly UO2).  
]]> 2017-04-26 21:39:12 UTC https://padlet.com/301200/ivw6306p2i4k/wish/168506747