Element Americium

Americium ElementIt is a transuranic member of the actinide series, in the periodic table located under the lanthanide element europium, and thus by analogy was named after the Americas
Americium is a synthetic radioactive chemical element with the symbol Am and atomic number 95.
In the periodic table, americium is located to the right of plutonium, to the left of curium, and below the lanthanide europium, with which it shares many similarities in physical and chemical properties.
Americium is a highly radioactive element. When freshly prepared, it has a silvery-white metallic lustre, but then slowly tarnishes in air.

Names and Identifiers

Chemical Formula:Am
Molecular Weight:243.00000 g/mol
EC Number :n/a
MDL Number:n/a
Color:silvery white
Other Names:Americio
PubChem CID:23966
IUPAC Name:Americiu
Canonical SMILES:[Am]
ICSC Number:n/a

Physical & Chemical Properties

Density:12 g/cm³
Boiling Point:2880 K ​(2607 °C, ​4725 °F)
Melting Point:1449 K ​(1176 °C, ​2149 °F)
Molecular Formula:Am
Flash Point:1175ºC
Exact Mass:243.06100

About 19 isotopes and 8 nuclear isomers are known for americium. There are two long-lived alpha-emitters; 243Am has a half-life of 7,370 years and is the most stable isotope, and 241Am has a half-life of 432.2 years.

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
237Am237.05031.22 hEC to 237Pu; α to 233Np5/2
238Am238.051981.63 hEC to 238Pu; α to 234Np1
239Am239.0530211.9 hEC to 239Pu; α to 235Np5/2
240Am240.055292.12 dEC to 240Pu; α to 236Np3
241Am241.05682432.2 yα to 237Np; SF5/21.61
242Am242.0565416.02 hEC to 242Pu; β to 242Cm10.388
243Am243.061375 (3)7370 yα to 239Np; SF5/21.61
244Am244.0642810.1 hβ to 244Cm1
245Am245.066442.05 hβ to 245Cm5/2

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