Actinium - Wikipedia
网页Actinium is a chemical element; it has symbol Ac and atomic number 89. It was first isolated by Friedrich Oskar Giesel in 1902, who gave it the name emanium; the element got its name by being wrongly identified with a substance André-Louis Debierne found in 1899 and called actinium.
Actinium - Element information, properties and uses | Periodic …
网页Element Actinium (Ac), Group 20, Atomic Number 89, d-block, Mass [227]. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Actinium | Radioactive, Decay, Alpha Particles | Britannica
网页Actinium (Ac), radioactive chemical element, in Group 3 (IIIb) of the periodic table, atomic number 89. Actinium was discovered (1899) by French chemist André-Louis Debierne in pitchblende residues left after French physicists Pierre and Marie Curie had extracted radium from them, and it was also.
Actinium | History, Uses, Facts, Physical & Chemical Characteristics
网页Actinium is a radioactive metal. It is the third element in row 7 of the periodic table. It is considered often as the first of the actinides, a group of “inner transition metals”. Quite recently discovered, it has been a useful metal in laboratory research over the past century.
Pictures, stories, and facts about the element Actinium in the …
网页Photographs and descriptions of many samples of the element Actinium in the Periodic Table.
Actinium (Ac) - Periodic Table
网页Actinium is a chemical element of the periodic table with chemical symbol Ac and atomic number 89 with an atomic weight of 227 u and is classed as actinide and is part of group 3 (scandium group). Actinium is solid at room temperature.
Actinium (Ac) - Periodic Table
网页Actinium is the 89th element in the periodic table and has a symbol of Ac and atomic number of 89. It has an atomic weight of (227) and a mass number of 205. Actinium has eighty-nine protons and one hundred sixteen neutrons in its nucleus, and eighty-nine electrons in seven shells.
Actinium (Ac) - American Elements
网页Actinium, a silver-white metallic element, is the namesake of the actinides group in the periodic table, a series of elements known for their radioactivity. Due to its radioactive nature and relative scarcity on Earth, actinium has not historically enjoyed many commercial or industrial uses or applications; however, that may be changing with ...
WebElements Periodic Table » Actinium » the essentials
网页Atomic number: 89. Relative atomic mass ( Ar): [ 227 ] (longest lived isotope) Standard state: solid at 298 K. Appearance: silvery. Classification: Metallic. Group in periodic table: Group name: Actinoid. Period in periodic table: 7 (actinoid) Block in periodic table: f. Shell structure: 2.8.18.32.18.9.2. CAS Registry: 7440-34-8.
Element Name: Actinium - Periodic Table
网页Actinium is a chemical element; it has symbol Ac and atomic number 89. Actinium gave the name to the actinide series, a set of 15 elements between actinium and lawrencium in the periodic table. Together with polonium, radium, and radon, actinium was one of the first non-primordial radioactive elements to be isolated.