Symbol: | Ra |
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Atomic Number: | 88 |
Atomic Weight: | 226 |
Element Category: | alkaline earth metal |
Group, Period, Block: | 2, 7, s |
Color: | silvery white/ metallic |
Other Names: | Radio |
Melting Point: | 696 °C, 1284.8 °F,969.15 K |
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Boiling Point: | 1737 °C, 3158.6 °F, 2010 K |
Density: | 5000 g/cm3 |
Liquid Density @ Melting Point: | N/A |
Density @ 20°C: | 5.5 g/cm3 |
Density of Solid: | N/A |
Specific Heat: | N/A |
Superconductivity Temperature: | N/A |
Triple Point: | N/A |
Critical Point: | N/A |
Heat of Fusion (kJ·mol-1): | 7.15 |
Heat of Vaporization (kJ·mol-1): | 136.7 |
Heat of Atomization (kJ·mol-1): | 159 |
Thermal Conductivity: | 18.6 W·m-1·K-1 |
Thermal Expansion: | N/A |
Electrical Resistivity: | (20 °C) 1 µΩ·m |
Tensile Strength: | N/A |
Molar Heat Capacity: | N/A |
Young's Modulus: | N/A |
Shear Modulus: | N/A |
Bulk Modulus: | N/A |
Poisson Ratio: | N/A |
Mohs Hardness: | N/A |
Vickers Hardness: | N/A |
Brinell Hardness: | N/A |
Speed of Sound: | N/A |
Pauling Electronegativity: | 0.9 |
Sanderson Electronegativity: | N/A |
Allred Rochow Electronegativity: | 0.97 |
Mulliken-Jaffe Electronegativity: | 0.92 (sp orbital) |
Allen Electronegativity: | N/A |
Pauling Electropositivity: | 3.1 |
Reflectivity (%): | N/A |
Refractive Index: | N/A |
Electrons: | 88 |
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Protons: | 88 |
Neutrons: | 138 |
Electron Configuration: | [Rn] 7s2 |
Atomic Radius: | N/A |
Atomic Radius, non-bonded (Å): | 2.83 |
Covalent Radius: | 221±2 pm |
Covalent Radius (Å): | 2.11 |
Van der Waals Radius: | 283 pm |
Oxidation States: | 2 (strongly basic oxide) |
Phase: | Solid |
Crystal Structure: | body-centered cubic |
Magnetic Ordering: | nonmagnetic |
Electron Affinity (kJ·mol-1) | 9.649 |
1st Ionization Energy: | 509.3 kJ·mol-1 |
2nd Ionization Energy: | 979.0 kJ·mol-1 |
3rd Ionization Energy: | N/A |
CAS Number: | 7440-14-4 |
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EC Number: | N/A |
MDL Number: | N/A |
Beilstein Number: | N/A |
SMILES Identifier: | [Ra] |
InChI Identifier: | InChI=1S/Ra |
InChI Key: | HCWPIIXVSYCSAN-UHFFFAOYSA-N |
PubChem CID: | 6328144 |
ChemSpider ID: | 4886483 |
Earth - Total: | 9.6 ppm |
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Mercury - Total: | 7.4 ppm |
Venus - Total: | 10.1 ppm |
Earth - Seawater (Oceans), ppb by weight: | 0.00000001 |
Earth - Seawater (Oceans), ppb by atoms: | 3E-10 |
Earth - Crust (Crustal Rocks), ppb by weight: | 0.0001 |
Earth - Crust (Crustal Rocks), ppb by atoms: | 0.00001 |
Sun - Total, ppb by weight: | N/A |
Sun - Total, ppb by atoms: | N/A |
Stream, ppb by weight: | 0.0000004 |
Stream, ppb by atoms: | 0.000000002 |
Meterorite (Carbonaceous), ppb by weight: | N/A |
Meterorite (Carbonaceous), ppb by atoms: | N/A |
Typical Human Body, ppb by weight: | 0.000001 |
Typical Human Body, ppb by atom: | 0.00000003 |
Universe, ppb by weight: | N/A |
Universe, ppb by atom: | N/A |
Discovered By: | Pierre Curie and Marie Curie |
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Discovery Date: | 1898 |
First Isolation: | Marie Curie (1902) |
Nuclide | Isotopic Mass | Half-Life | Mode of Decay | Nuclear Spin | Magnetic Moment | Binding Energy (MeV) | Natural Abundance (% by atom) |
---|---|---|---|---|---|---|---|
202Ra | 202.00989(7) | 2.6(21) ms [0.7(+33-3) ms] | Unknown | 0+ | N/A | 1533.16 | - |
203Ra | 203.00927(9) | 4(3) ms | a to 199Rn; ß+ to 203Fr | (3/2-) | N/A | 1541.24 | - |
204Ra | 204.006500(17) | 60(11) ms [59(+12-9) ms] | a to 200Rn; ß+ to 204Fr | 0+ | N/A | 1549.31 | - |
205Ra | 205.00627(9) | 220(40) ms [210(+60-40) ms] | a to 201Rn; ß+ to 205Fr | (3/2-) | N/A | 1557.39 | - |
206Ra | 206.003827(19) | 0.24(2) s | a to 202Rn | 0+ | N/A | 1565.47 | - |
207Ra | 207.00380(6) | 1.3(2) s | a to 203Rn; ß+ to 207Fr | (5/2-,3/2-) | N/A | 1573.55 | - |
208Ra | 208.001840(17) | 1.3(2) s | a to 204Rn; ß+ to 208Fr | 0+ | N/A | 1581.63 | - |
209Ra | 209.00199(5) | 4.6(2) s | a to 205Rn; ß+ to 209Fr | 5/2- | N/A | 1589.71 | - |
210Ra | 210.000495(16) | 3.7(2) s | a to 206Rn; ß+ to 210Fr | 0+ | N/A | 1597.79 | - |
211Ra | 211.000898(28) | 13(2) s | a to 207Rn; ß+ to 211Fr | 5/2(-) | N/A | 1605.87 | - |
212Ra | 211.999794(12) | 13.0(2) s | a to 208Rn; ß+ to 212Fr | 0+ | N/A | 1623.26 | - |
213Ra | 213.000384(22) | 2.74(6) min | a to 209Rn; ß+ to 213Fr | 1/2- | N/A | 1622.02 | - |
214Ra | 214.000108(10) | 2.46(3) s | a to 210Rn; ß+ to 214Fr | 0+ | N/A | 1630.1 | - |
215Ra | 215.002720(8) | 1.55(7) ms | a to 211Rn | (9/2+)# | N/A | 1638.18 | - |
216Ra | 216.003533(9) | 182(10) ns | a to 212Rn; EC to 216Fr | 0+ | N/A | 1646.26 | - |
217Ra | 217.006320(9) | 1.63(17) µs | a to 213Rn | (9/2+) | N/A | 1654.34 | - |
218Ra | 218.007140(12) | 25.2(3) µs | a to 214Rn | 0+ | N/A | 1662.42 | - |
219Ra | 219.010085(9) | 10(3) ms | a to 215Rn | (7/2)+ | N/A | 1661.18 | - |
220Ra | 220.011028(10) | 17.9(14) ms | a to 216Rn | 0+ | N/A | 1669.26 | - |
221Ra | 221.013917(5) | 28(2) s | a to 217Rn; 14C | 5/2+ | N/A | 1677.34 | - |
222Ra | 222.015375(5) | 38.0(5) s | a to 218Rn; 14C | 0+ | N/A | 1685.42 | - |
223Ra | 223.0185022(27) | 11.43(5) d | a to 219Rn; 14C | 3/2+ | 0.271 | 1693.49 | - |
224Ra | 224.0202118(24) | 3.6319(23) d | a to 220Rn; 12C | 0+ | N/A | 1692.26 | - |
225Ra | 225.023612(3) | 14.9(2) d | ß- to 225Ac | 1/2+ | -0.734 | 1700.33 | - |
226Ra | 226.0254098(25) | 1600(7) y | a to 222Rn; 14C | 0+ | N/A | 1708.41 | - |
227Ra | 227.0291778(25) | 42.2(5) min | ß- to 227Ac | 3/2+ | -0.404 | 1716.49 | - |
228Ra | 228.0310703(26) | 5.75(3) y | ß- to 228Ac | 0+ | N/A | 1715.25 | - |
229Ra | 229.034958(20) | 4.0(2) min | ß- to 229Ac | 5/2(+) | N/A | 1723.33 | - |
230Ra | 230.037056(13) | 93(2) min | ß- to 230Ac | 0+ | N/A | 1731.41 | - |
231Ra | 231.04122(32)# | 103(3) s | ß- to 231Ac | (5/2+) | N/A | 1730.17 | - |
232Ra | 232.04364(30)# | 250(50) s | ß- to 232Ac | 0+ | N/A | 1738.25 | - |
233Ra | 233.04806(50)# | 30(5) s | ß- to 233Ac | 1/2+# | N/A | 1746.33 | - |
234Ra | 234.05070(53)# | 30(10) s | ß- to 234Ac | 0+ | N/A | 1745.09 | - |
Village of Radium Hot Springs[1] | |
Location of Radium Hot Springs in British Columbia | |
Coordinates: 50°37′03″N116°04′19″W / 50.6175°N 116.072°WCoordinates: 50°37′03″N116°04′19″W / 50.6175°N 116.072°W | |
Country | Canada |
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Province | British Columbia |
Region | Columbia Valley/East Kootenay (Canadian Rockies) |
Regional district | East Kootenay |
Incorporated | 1991 |
Government | |
• Governing body | Radium Town Council |
• Mayor | Clara Reinhardt |
Area | |
• Land | 6.34 km2 (2.45 sq mi) |
Elevation | 808 m (2,651 ft) |
Population (2016)[2] | |
• Total | 776 |
• Density | 122.4/km2 (317/sq mi) |
Time zone | UTC−7 (MST) |
• Summer (DST) | UTC−6 (MDT) |
Postal code | |
Area code(s) | 250 / 778 / 236 |
Highways | Hwy 93 Hwy 95 |
Waterways | Columbia River |
Website | Radium Hot Springs |
Wikimedia Commons has media related to Radium Hot Springs. |