Plutonium was discovered in 1941 by Glenn Seaborg, Joseph Kennedy, Arthur Wahl, and Edwin McMillan.
Plutonium is highly radioactive and you mainly hear about plutonium when it comes to nuke-clear bombs. With that being said it is very dangerous to be around. When someone is hit with Alpha radiation which is the most dangerous type of radiation it enters the body through the lungs and then moves throughout the body into the bones, liver, and other organs. When Alpha radiation is in your body you have a high chance to end up having lung or liver cancer which both are really bad. What makes plutonium more dangerous is that it when it is contaminated it will take up 10 to 20 times its normal life span. Plutonium on the periodic table is labeled Pu. From what I have found is that there is a little amount of natural plutonium on Earth and most of it is made synthetically. Plutonium is an interesting subject I found out a lot of things I didn't know about it and I hope to do more research on it in the future.