Actinium

= Actinium - Ac =


 * Name:** Actinium
 * Symbol:** Ac
 * A****tomic Number:** 89
 * Atomic Mass:** (227.0) AMU
 * Melting Point:** 1050.0 °C (1323.15 K, 1922.0 °F)
 * Boiling Point:** 3200.0 °C (3473.15 K, 5792.0 °F)
 * Number of Protons/Electrons:** 89
 * of Neutrons: **138**

Classification: **rare earth** Crystal Structure: **Cubic** Density @ 293 K: **10.07 g/cm 3 ** Color: **Silver color** Number of Energy Levels: **7** First Energy Level:**2** Second Energy Level:**8** Third Energy Level:**18** Fourth Energy Level:**32** Fifth Energy Level:**18** Sixth Energy Level:**9** Seventh Energy Level:**2

Isotopes

 * ** Isotope ** || ** Half Life ** ||
 * Ac-225 || 10.0 days ||
 * Ac-226 || 1.2 days ||
 * Ac-227 || 21.8 years ||
 * Ac-228 || 6.16 hours ||

Facts

 * Date of Discovery:** 1899
 * Discoverer:** Andre Debierne
 * Name Origin:** From the Greek word //aktinos// (ray)
 * Uses:** None known today
 * Obtained From:** extremely rare

Brief description: actinium is dangerously radioactive. The chemical behavior of actinium is similar to that of the rare earths, particularly lanthanum. It is found naturally in uranium ores and actinium is 150 times more radioactive than radium. Table: basic information about and classifications of actinium.|| * Name: Actinium
 * Symbol: Ac
 * Atomic number: 89
 * Atomic weight: [ 227 ]
 * Standard state: solid at 298 K
 * CAS Registry ID: 7440-34-8
 * * Group in periodic table:
 * Group name: Actinoid
 * Period in periodic table: 7 (actinoid)
 * Block in periodic table: f-block
 * Colour: silvery
 * Classification: Metallic ||

History: Actinium was discovered in 1899 by André-Louis Debierne, a French chemist, who separated it from pitchblende. Friedrich Oskar Giesel independently discovered actinium in 1902. The chemical behavior of actinium is similar to that of the rare earth lanthanum. The word actinium comes from the Greek //aktis, aktinos//, meaning beam or ray.

Atomic #89

Atomic Mass: 227

Actinium is a silvery radioactive metallic element. It glows in the dark due to its intense radioactivity with a blue light .Discovered in 1899, it gave the name to the actinide series. It reacts rapidly with moisture and oxygen in the air forming a white sheath of actinium oxide which prevents further oxidation. Because there is little actinium, the price and radioactivity cause it to have little industrial use. Its current applications include a neutron source and an agent for radiation therapy targeting cancer cells in the body. Actinium has two meta states with one being a radioactive isotope. Isotopes are variants of an element. They have the same amount of protons but a different number of neutrons. Actinium's isotope is called 217Ac which decays through alpha decay and electron capture. This element is found in very small amounts within uranium ores, but it also be created by bombarding radium with neutrons in a nuclear reactor.

History
Discovered by a french chemists (Adndre-Louis Debierne) is 1899. The French chemists described actinium as it being similar to titanium and (in19000) similar to thorium. This was also independently discovered in 1902 by Fredrich Oskar Giesel, which was described by him as being similar to lanthanum. The name, Actinium comes from the Greek word, aktis, aktinos meaning 'beam' or 'ray'.



Actinium was discovered in 1899 by André-Louis Debierne, a French chemist, while experimenting with new methods of separating rare earth oxides. Friedrich Otto Giesel independently discovered actinium in 1902. Actinium is a rare element that is present in [|uranium] ores in tiny amounts, but it is usually cheaper and easier to create actinium when it is needed by bombarding [|radium] with [|neutrons] in a nuclear reactor.