87
Fr
francium
[223]

General properties

Group
group 1 (H and alkali metals)
Period
period 7
Category
alkali metals
Standard atomic weight
-
Melting point
281.0 K (7.9 °C)
Boiling point
890 K (617 °C)
Phase at STP
solid

Additional properties

Block
s-block
Electron configuration
[Rn] 7s¹
Electrons per shell
2, 8, 18, 32, 18, 8, 1
Electronegativity
>0.79
Density
2.48 g/cm³ (estimated)
Oxidation states
+1 (a strongly basic oxide)
CAS Number
7440-73-5