Radium (Ra)
General Properties
| Symbol | Ra |
|---|---|
| Atomic Number | 88 |
| Atomic Weight | (226) |
| Group |
2 (alkaline earth metals or beryllium family)
IIA (IUPAC), IIA (CAS)
Solid, Conductor, Alkaline Earth Metal, Metal, Radioactive, Natural
|
| Period | 7 |
| Block | s |
Physical Properties
| Density | 5.0 g/cm3 |
|---|---|
| Atomic Volume | 45.2 cm3/mole |
| Atomic Radius | 2.33 angstroms |
| Covalent Radius | -- |
| Crust Abundance | 9.9E-12% |
| Crystal Structure | Cubic: Body centered |
| Color | Silver |
States
| Melting Point | 700.0 °C |
|---|---|
| Boiling Point | 1140.0 °C |
| Heat of Fusion | 8.37 kJ/mol |
| Heat of Vaporization | 136.82 kJ/mol |
Energy
| Electronegativity | 0.9 (Pauling Scale) |
|---|---|
| Electron Affinity | -- |
| 1st Ionization Energy | 509 kJ/mol |
| 2. Ionization Energy | 979.0 kJ/mol |
| Specific Heat Capacity | 0.094 J g−1 K−1 |
| Thermal Conductivity | 18.6 W·m−1·K−1 |
Electrons & Oxidation
| Oxidation States | 2 |
|---|---|
| Electrons Per Shell | 2 8 18 32 18 8 2 |
| Electron Configuration | [Rn] 7s2 |
| 1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 5s2 5p6 4f14 5d10 6s2 6p6 7s2 | |
|
Orbital Diagram
1s ↿⇂ 2s ↿⇂ 2p ↿⇂ ↿⇂ ↿⇂ 3s ↿⇂ 3p ↿⇂ ↿⇂ ↿⇂ 3d ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ 4s ↿⇂ 4p ↿⇂ ↿⇂ ↿⇂ 4d ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ 4f ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ 5s ↿⇂ 5p ↿⇂ ↿⇂ ↿⇂ 5d ↿⇂ ↿⇂ ↿⇂ ↿⇂ ↿⇂ 5f 6s ↿⇂ 6p ↿⇂ ↿⇂ ↿⇂ 6d 6f 7s ↿⇂ 7p 7d 7f |
|
Nuclear
| Radioactive | Yes |
|---|---|
| Half Life | 1.59×103 |
| Lifetime | 2.31×103y |
| Decay | Alpha Emission |
Media
- Description
- Silvery-white metal. Intensely radioactive.
- Uses
- Used in treating cancer because of the gamma rays it gives off.
- Sources
- Found in uranium ores at 1 part per 3 million parts uranium.
- Pronounciation (English)
- RAY-di-em
Translations
| Afrikaans | Radium | |
| Aragonese | Radio | |
| العربية | راديوم | |
| Armãneashte | Radiumu | |
| asturianu | Radiu | |
| azərbaycan | Radium | |
| български | Радий | |
| বাংলা | রেডিয়াম | |
| brezhoneg | Radiom | |
| bosanski | Radij[um] | |
| Byelorussian | Радый | |
| Cebuano | Radyo | |
| čeština | Radium | |
| Chuvash | Ради | |
| Cymraeg | Radi | |
| dansk | Radium | |
| Deutsch | Radium | |
| Ελληνικά | Ραδιο | |
| English | Radium | |
| esperanto | Radiumo | |
| español | Radio | |
| eesti | Raadium | |
| euskara | Radioa | |
| فارسی | رادیم | |
| suomi | Radium | |
| føroyskt | Radium | |
| français | Radium | |
| furlan | Radi | |
| Frysk | Radium | |
| Gaeilge | Raidiam | |
| Gàidhlig | Raidiam | |
| galego | Radio | |
| ગુજરાતી | રેડિયમનો | |
| Gaelg | Raadjum | |
| Hakka Chinese | Luì (鐳) | |
| עברית | רדיום | |
| हिन्दी | रेडियम | |
| hrvatski | Radij | |
| magyar | Rádium | |
| հայերեն | Ռադիում | |
| Indonesia | Radium | |
| íslenska | Radín | |
| italiano | Radio | |
| 日本語 | ラジウム | |
| ქართული | რადიუმი | |
| کٲشُر | Rôd | |
| қазақ тілі | Радий | |
| 한국어 | 라듐 | |
| kurdî | Radyûm | |
| Komi | Радий | |
| kernewek | Radyum | |
| кыргызча | Радий | |
| Latin | Radium | |
| Lëtzebuergesch | Radium | |
| Lombard | Ràdi | |
| lingála | Ladu | |
| lietuvių | Radis | |
| latviešu | Rādijs | |
| Mari | Радий | |
| Māori | Konuruke | |
| македонски | Радиум | |
| മലയാളം | റേഡിയം | |
| монгол | Ради | |
| Мокшан | Ради | |
| Melayu | Radium | |
| Malti | Radju[m] | |
| Nahuatl | Radio | |
| Nederlands | Radium | |
| norsk | Radium | |
| Occitan | Radi | |
| ирон | Радий | |
| polski | Rad | |
| português | Rádio | |
| Runasimi | Radyu q'illay | |
| română | Radiu | |
| русский | Радий | |
| slovenčina | Radium | |
| slovenščina | Radij | |
| Samoan | Radimi | |
| Samogitian | Radis | |
| shqip | Radium | |
| српски | Радијум | |
| Southern Sotho | Radiamo | |
| svenska | Radium | |
| Kiswahili | Radi | |
| தமிழ் | ரேடியம் | |
| тоҷикӣ | Радий | |
| ไทย | เรเดียม | |
| Türkçe | Radyum | |
| ئۇيغۇرچە | رادىي | |
| українська | Радій | |
| o‘zbek | Radiy | |
| Tiếng Việt | Rađi | |
| Võro | Raadium | |
| 中文 | 鐳 |
History
- Discovered In
- 1898
- Discovered By
- Pierre and Marie Curie
- Discovered At
- France
- Word Origin
- From the Latin word "radius" meaning "ray"