Chemical elements
  Americium
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Element Americium, Am





History

The member of actinide or actinoid group of chemical elements - Americium was synthesized in 1944-45 by Glenn T. Seaborg, Ralph A. James, and Leon O. Morgan, at the Metallurgical Laboratory of the University of Chicago by irradiation of Plutonium with neutrons. After americium discovery it became clear that the heavy transuranium elements are members of series similar to that of rare-earth elements, lanthanoides. From element to element the 5f-shell is being filled like the 4f-shell of lanthanoides. Americium contains six 5f electrons, and it is similar to europium which contains six 4f electrons. That was the reason to name the element number 95 americium after America as europium was named after Europe.


Occurrence

Americium does not have stable isotopes and therefore not detected in nature.

Neighbours



Chemical Elements

57La
138.9
Lanthanum
72Hf
178.5
Hafnium
73Ta
180.9
Tantalum
94Pu
[244.0]
Plutonium
95Am
[243.0]
Americium
96Cm
[247.0]
Curium

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