| Caesium |
|
55Cs
|
|
|
| Ìhànsójú |
silvery gold
 |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
caesium, Cs, 55 |
| Ìpèlóhùn |
/ˈsiːziəm/, SEE-zee-əm |
| Ẹ̀ka ẹ́límẹ̀nti |
alkali metal |
| Ẹgbẹ́, àsìkò, àdìpò |
1, 6, s |
| Ìwúwo átọ́mù |
132.9054519(2) |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Xe] 6s1
2, 8, 18, 18, 8, 1 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
1.93 g·cm−3 |
| Liquid density at m.p. |
1.843 g·cm−3 |
| Melting point |
301.59 K, 28.44 °C, 83.19 °F |
| Boiling point |
944 K, 671 °C, 1240 °F |
| Critical point |
1938 K, 9.4 MPa |
| Heat of fusion |
2.09 kJ·mol−1 |
| Heat of vaporization |
63.9 kJ·mol−1 |
| Molar heat capacity |
32.210 J·mol−1·K−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
418 |
469 |
534 |
623 |
750 |
940 |
|
| Atomic properties |
| Oxidation states |
1
(strongly basic oxide) |
| Electronegativity |
0.79 (Pauling scale) |
| Ionization energies |
1st: 375.7 kJ·mol−1 |
| 2nd: 2234.3 kJ·mol−1 |
| 3rd: 3400 kJ·mol−1 |
| Atomic radius |
265 pm |
| Covalent radius |
244±11 pm |
| Van der Waals radius |
343 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic
|
| Magnetic ordering |
paramagnetic[1] |
| Electrical resistivity |
(20 °C) 205 Ω·m |
| Thermal conductivity |
35.9 W·m−1·K−1 |
| Thermal expansion |
(25 °C) 97 µm·m−1·K−1 |
| Young's modulus |
1.7 GPa |
| Bulk modulus |
1.6 GPa |
| Mohs hardness |
0.2 |
| Brinell hardness |
0.14 MPa |
| CAS registry number |
7440-46-2 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù caesium |
|
|
|
· r |
Kesium tabi kaesium je apilese kemika pelu ami-idamo Cs ati nomba atomu 55.
