| Radium |
|
88Ra
|
|
|
| Ìhànsójú |
| silvery white metallic |
| Àwọn ìdámọ́ wíwọ́pọ̀ |
| Orúkọ, àmì-ìdámọ́, nọ́mbà |
radium, Ra, 88 |
| Ẹ̀ka ẹ́límẹ̀nti |
alkaline earth metal |
| Ẹgbẹ́, àsìkò, àdìpò |
2, 7, s |
| Ìwúwo átọ́mù |
(226) |
| Ìtòléra ẹ̀lẹ́ktrónì |
[Rn] 7s2
2, 8, 18, 32, 18, 8, 2 |
| Physical properties |
| Phase |
solid |
| Density (near r.t.) |
5.5 g·cm−3 |
| Melting point |
973 K, 700 °C, 1292 °F |
| Boiling point |
2010 K, 1737 °C, 3159 °F |
| Heat of fusion |
8.5 kJ·mol−1 |
| Heat of vaporization |
113 kJ·mol−1 |
| Vapor pressure |
| P (Pa) |
1 |
10 |
100 |
1 k |
10 k |
100 k |
| at T (K) |
819 |
906 |
1037 |
1209 |
1446 |
1799 |
|
| Atomic properties |
| Oxidation states |
2 (strongly basic oxide) |
| Electronegativity |
0.9 (Pauling scale) |
| Ionization energies |
1st: 509.3 kJ·mol−1 |
| 2nd: 979.0 kJ·mol−1 |
| Covalent radius |
221±2 pm |
| Van der Waals radius |
283 pm |
| Miscellanea |
| Crystal structure |
body-centered cubic
|
| Magnetic ordering |
nonmagnetic |
| Electrical resistivity |
(20 °C) 1 µΩ·m |
| Thermal conductivity |
18.6 W·m−1·K−1 |
| CAS registry number |
7440-14-4 |
| Àwọn ísótòpù dídúró jùlọ |
| Main article: Àwọn ísótòpù radium |
|
|
|
· r |
Radiomu (pípè /ˈradiəmu/, RAY-dee-əm) je ipilese elegbogi to ni ami-idamo Ra ati nomba atomu 88.
