The Disappearing Spoon By Sam Kean
Chapter 6 Completing The Table...With A Bang By: Hope Kelley
Element 61- Promethium
On the periodic Table the element Promethium is not found in a regular period or a "Family" group, but it is found in a different group called Lanthanide series. It was named after a Greek mythology who stole fire and gave it to humans, and was punished for eternity for doing so. It's atomic number is 61 and it's atomic mass is 145. It is classified as a transition metal and it's electron configuration is 1s^2 2s^2 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^5. It can be found in uranium ores.
Element 94 - Plutonium
Element 27- Cobalt
"The Element Promethium." It's Elemental -. Steve Gagnon. Web. 23 Jan. 2016.
"The Element Plutonium." It's Elemental -. Steve Gagnon. Web. 23 Jan. 2016.