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 1
H
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D
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Chemical Elements

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Particle Zoo | Chemical Calculators | Atomic Collider Simulation
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He
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Li
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Be
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B
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C
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N
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O
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F
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Ne
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Na
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Mg
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Al
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Si
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P
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S
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Cl
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Ar
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K
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Ca
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Sc
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Ti
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V
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Cr
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Mn
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Fe
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Co
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Ni
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Cu
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Zn
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Ga
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Ge
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As
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Se
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Br
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Kr
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Rb
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Sr
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Y
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Zr
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Nb
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Mo
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Tc
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Ru
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Rh
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Pd
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Ag
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Cd
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In
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Sn
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Sb
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Te
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I
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Xe
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Cs
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Ba
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Hf
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Ta
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W
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Re
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Os
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Ir
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Pt
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Au
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Hg
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Tl
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Pb
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Bi
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Po
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At
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Rn
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Fr
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Ra
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Ac-Lr

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Rf

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Db

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Sg

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Hs

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Mt

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Ds

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Rg

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Mc

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Lv

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Ts

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Og

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La
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Eu
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Gd
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Tb
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Dy
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Ho
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Er
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Lu
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Ac
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Th
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Pa
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U
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Np
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Pu
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Am
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Cm
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Bk
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Cf
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Es
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Fm
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Md
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No
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Lr

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     95    

95 Am Americium

Actinoid, mass: 243 u, no stable and no natural isotopes.

A small disc of americium 241. Photo: Bionerd, released under CC BY 3.0 license.

Americium

Americium is the first synthetic element, from here onwards all elements have to be produced in laboratories. These are very radioactive. The most stable isotope of americium, 243Am, has a half-life of just under 7400 years. Due to its strong alpha radiation, americium is very dangerous. In some countries americium 241 (432 years half-life) is used in tiny amounts in smoke detectors for ionizing air. Americium emerges in small amounts in nuclear reactors from plutonium and mostly decays to neptunium.


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