Americium electronic configuration

Periodic Table Americium, http //www.chemicalelements.com/elements/am.html (accessed September 6> 2005). Periodic Table Plutonium, http //www.chemicalelements.com/elements/pu.html (accessed September 6> 2005). Periodic Table Protactinium, http //www.chemicalelements.com/elements/pa.html (accessed September 6> 2005). Periodic Table Thorium (accessed September 6> 2005).Periodic Table Uranium (accessed September 6, 2005).Periodic Table Electron Configuration, http //www.chemicalelements.com/ show/electronconfig.html (accessed November... 

Tn accordance with its electronic configuration and the resulting posi-tion in the periodic system of elements the actinide element americium is the heavy homolog of the rare earth element europium (14) ... 

Nobelium is a member of the actinide series of elements. The ground state electron configuration is assumed to be (Rn)5fl47s2, by analogy with the equivalent lanthanide element ytterbium ([Kr]4fl46s2) there has never been enough nobelium made to experimentally verify the electronic configuration. Unlike the other actinide elements and the lanthanide elements, nobelium is most stable in solution as the dipositive cation No ". Consequently its chemistry resembles that of the much less chemically stable dipositive lanthanide cations or the common chemistry of the alkaline earth elements. When oxidized to No, nobelium follows the well-estabhshed chemistry of the stable, tripositive rare earth elements and of the other tripositive actinide elements (e.g., americium and curium), see also Actinium Berkelium Einsteinium Fermium Lawrencium Mendele-vium Neptunium Plutonium Protactinium Ruthereordium Thorium Uranium. 

The following elements also have the same electronic configuration as actinium (i.e. 5s 5pl) in their outer-most electronic orbitals, while the inner 4d orbitals are being filled, on going from element to element. Neptunium, Plutonium, Americium, Curium, Berkelium... 

The superheavy elements are leading to deeper understanding of nuclear chemistry and the periodic table much as the lanthanides did at the start of the 20th century and the actinides did in mid-century. The favored +3 oxidation states of the lanthanides have electronic configurations 4f, 4f, 4f. .. 4f 4f 4f for the 14 consecutive lanthanides Ce through Lu respectively. These rare earths are chemically similar (and hard to separate) because their 4f orbitals exert little influence on reactivity. When Glenn T. Seaborg synthesized americium (95) and curium (96) in 1944, he discovered that, like the lanthanides, they readily form +3 oxidation states and fill 5f orbitals. In 1944, he proposed a new transi-... 

Electron configurations of gaseous americium species as determined from spectroscopic and atomic-beam experiments show a Sf 7s ground state and (Sf 7 2 + 2 and Tables 14.3 and 15.6], Americium is the sixth member of the... 

The change in the electronic configuration of americium is due to the stability associated with half completed /-subshells. 

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