87
Fr
Francium
(223) | 2
8
18
32
18
8
1
|
87
Fr
Francium
(223) | 2
8
18
32
18
8
1
|
| General |
|---|
| Name | Francium | | Symbol | Fr | | Number | 87 | | Chemical series | Alkali metals | | Group / Period | 1 / 7 | | Block | s-block | | CAS registry number | 7440-73-5 |
| Physical properties |
|---|
| State | solid | | Density | 1.87 g/cm3 | | Melting point | 300 K (27 °C, 80 °F) | | Boiling point | 950 K (677 °C, 1250 °F) | | Critical point | |
| Atomic properties |
|---|
| Atomic Weight | (223) g/mol | | Crystal structure | cubic body centered | | Electronegativity | 0.7 | | Atomic radius | | | Atomic radius (calculated) | | | Electron configuration | [Rn] 7s1 | | Electrons per shell | 2, 8, 18, 32, 18, 8, 1 | | Number of protons | 87 | | Number of neutrons | 136 |
|
Radium