"20 most important elements" by Henry Chavez Aguilar https://padlet.com/3013522/a8o4sd2ih0ui en-us 2017-04-26 21:29:35 UTC 2025-12-10 22:20:23 UTC hello@padlet.com 3013522 https://padlet.com/3013522/a8o4sd2ih0ui/wish/168506637 Actinium
symbol: Ac
atomic number: 89
important fact: Actinium is found naturally in uranium ores such as pitchblende (mostly UO2).]]> 2017-04-26 21:38:14 UTC https://padlet.com/3013522/a8o4sd2ih0ui/wish/168506637 3013522 https://padlet.com/3013522/a8o4sd2ih0ui/wish/168507608 Aluminium
symbol: Al
atomic number:
important fact:]]> 2017-04-26 21:48:26 UTC https://padlet.com/3013522/a8o4sd2ih0ui/wish/168507608