|Name, symbol||Actinium, Ac|
|Appearance||Silvery metallic, glows lightly blue in the dark|
|Actinium in the periodic table|
|Standard atomic weight (Ar)|
|Group, block||3 (sometimes considered group n/a); d-block (sometimes considered to be f-block)|
|Electron configuration||[Rn] 6d1 7s2|
|2, 8, 18, 32, 18, 9, 2|
|Melting point||1500 K (1227 °C, 2240 °F) (estimated)|
|Boiling point||3500±300 K (3200±300 °C, 5800±500 °F) (extrapolated)|
|Density near r.t.||10 g/cm3|
|Heat of fusion||14 kJ/mol|
|Heat of||400 kJ/mol|
|Molar heat capacity||27.2 J/(mol·K)|
|Electronegativity||Pauling scale: 1.1|
1st: 499 kJ/mol |
2nd: 1170 kJ/mol
3rd: 1900 kJ/mol
|Covalent radius||215 pm|
|Thermal conductivity||12 W/(m·K)|
|CAS Registry Number||7440-34-8|
|Discovery and first isolation||Friedrich Oskar Giesel (1902)|
|Named by||André-Louis Debierne (1899)|
Actinium (Ac) is a highly radioactive, silvery-metallic element with a bluish glow due to its extreme radiation.
Actinium is a soft metal, comparable to sodium in consistency. Pure actinium is silvery-white, though it quickly oxidises in air to form a white crust. It has a density of approximately 10g/cm3. Due to it's intense radiation, actinium glows a dull blue-green.
Due to its extreme radioactivity and the difficulty to produce it, it is only available to a select few industries for very high prices.
Even though extremely impractical, one might be able to extract very tiny amounts of it from uranium ores. It occurs in thorium, but at so small amounts that it's basically impossible to extract enough of it to be able to collect it.
- Element collection
Actinium is extremely radioactive and emits a lot of carcinogenic and toxic radiation. Handle it in a glove box with thick gloves and walls, walls preferably of lead glass.
Store in a thick lead-walled container.
The best method of disposal is probably to leave it in an area with a lot of natural radioactive ores.