Atomic Properties of Fr
- Atomic Number of Fr
- 87
- Atomic Mass of Fr
- 223.0000 u
- Electron Configuration
- [Rn] 7s1
- Electronegativity
- 0.79
- Block
- s-block
- Group
- 1
- Period
- 7
Francium is the urban legend of the alkali metals. Everyone talks about how wild he would be if you met him, but almost no one actually has.
He is extremely radioactive and breaks down so quickly that you cannot really keep a chunk of him around to show off. If the alkali family had a group photo, Francium would be the blurry one in the corner who had already left.
On paper, he is expected to be even more reactive than Cesium, which is already a lot. In practice, his short life and intense radioactivity mean he mostly appears as brief flashes in nuclear experiments, like a character who pops into the story, delivers one dramatic line, and vanishes.
Because there is so little of him and he disappears so fast, Francium does not get common uses in everyday life. No batteries, no lamps, no snack-food reputation. Just a strong presence in homework problems and theoretical discussions.
Francium is the mysterious relative everyone has heard of but nobody invites over, partly because he can not stay long and partly because your lab is not rated for that kind of energy.