Francium Cube Element Heritage Personal Museum Pure potassium is shiny bluish-silver

Pure potassium is shiny bluish-silver metal

It is also used in nuclear reactors and radiation shielding

In order to produce the correct sizes for the Periodic Table

This Flag in particular had a reaction with the acrylic and is difficult to see

Bromine's atomic number is 35 and its symbol is Br

Francium Cube Element Heritage Personal Museum Pure potassium is shiny bluish-silverFrancium's atomic number is 87 and its symbol is Fr. It is extremely radioactive; its most stable isotope, francium 223, has a half life of only 22 minutes. Bulk francium has never been seen, since the extreme heat of decay resulting from its short half life would immediately vaporize any viewable quantity of the element. Named after the country it was discovered in, France. It was the last element first discovered in nature, rather than by synthesis.