|
|
| Atomic symbol: Ac |
| Atomic number: 89 |
| Atomic weight: 227 |
| Atomic volume: 22.54 cm3/mol |
| Density: 10.07 g/cm3 |
| Period Number: 7 |
| Group number: none |
| Group name: Actinide |
| Element classification: Metal |
| Phase at room temperature: Solid |
| Melting Point: 1324 K (1051°C or 1924°F) |
| Boiling point: 3471 K (3198°C or 5788°F) |
| Heat of fusion: ? |
| Heat of vaporization: ? |
| Ionization Energy: 5.17 eV |
| 1st ionization energy: 499 kJ/mole |
| 2nd ionization energy: 1170 kJ/mole |
| 3rd ionization energy: kJ/mole |
| Electronegativity: 1.1 |
| Electron affinity: kJ/mole |
| Specific heat: ? |
| Heat atomization: 385 kJ/mole atoms |
| Shells: 2,8,18,32,18,9,2 |
| Electron Shell Configuration: [Rn]7s26d1 |
| Minimum oxidation number: 0 |
| Maximum oxidation number: 3 |
| Minimum common oxidation number: 0 |
| Maximum common oxidation no: 3 |
Appearance & Characteristics |
| Structure:: fcc: face-centered cubic |
| Color: silvery-white |
| Hardness: mohs |
| Toxicity: ? |
| Characteristics: Radioactive |
| Uses: thermoelectric power |
| Reaction with air: mild, w/ht, =>Ac2O3 |
| Reaction with 6M HCl: mild, =>H2, AcCl3 |
| Reaction with 15M HNO3: mild, =>Ac(NO3)3 |
| Reaction with 6M NaOH: ? |
| Number of isotopes: 2 |
| Oxide(s): Ac2O3 |
| Hydride(s): AcH2 |
| Chloride(s): AcCl3 |
| Atomic Radius: 187.8 pm |
| Ionic radius (1- ion): pm |
| Ionic radius (1+ ion): pm |
| Ionic radius (2- ion): pm |
| Ionic radius (2+ ion): pm |
| Ionic radius (3+ ion): 126 pm |
| Thermal conductivity: J/m-sec-deg |
| Electrical conductivity: 1/mohm-cm |
| Polarizability: 32.1 A^3 |
| Source: Synthetic(U-235 decay) |
| Relative abundance solar system: log |
| Abundance earth's crust: -9.3 log |
| Estimated crustal abundance: 5.5×10-10 mg/kg |
| Estimated oceanic abundance: No Data Available |
|
|
|
| (Gr. aktis, aktinos, beam or ray). Discovered by Andre Debierne in 1899 and independently by F. Giesel in 1902. Occurs naturally in association with uranium minerals. |
Actinium-227, a decay product of uranium-235, is a beta emitter with a 21.6-year half-life. Its principal decay products are thorium-227 (18.5-day half-life), radium-223 (11.4-day half-life), and a number of short-lived products including radon, bismuth, polonium, and lead isotopes. In equilibrium with its decay products, it is a powerful source of alpha rays. Actinium metal has been prepared by the reduction of actinium fluoride with lithium vapor at about 1100 to 1300-degrees C.
The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum. Purified actinium comes into equilibrium with its decay products at the end of 185 days, and then decays according to its 21.6-year half-life. It is about 150 times as active as radium, making it of value in the production of neutrons.
|
 |
Would you like to contact senior executives directly? Join our network on OurMetals.com
It's free and only takes 2 minutes to register. |
|
|
|
 Company
|
| SEKOM Handelsges.m.b.H.... |
|
Our company is a private firm founded in 1990 with aim to develop export and import with Russia. We do promote EU industrial and consumer goods in Russia and strongly support marketing of Russian and CIS industrial products and services.
|
|
0 selling
&
0 buying
leads |
|
Friendly links
|
|
