Periodic Table/Americium/²⁴⁹Am

← 248Am

²⁴⁹Am

Americium-249

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

95

Neutrons (N)

154

Mass Number (A)

249

Atomic Mass

249.078480AMU

Spin / Parity

5/2

Binding E/A

7.284keV

Natural Abundance

Trace / None

Half-life

Unknown

Decay Modesoverview · half-life · α · β⁻ · β⁺

β⁻

Decay Chain

²⁴⁹AmAmericium?

β⁻

²⁴⁹CmCurium1.07 h

β⁻100.0%

²⁴⁹BkBerkelium327 d

β⁻100.0%

α²⁴⁵Am0.00%

²⁴⁹CfCalifornium351 y

α100.0%

²⁴⁵CmCurium8.25 ky

α100.0%

²⁴¹PuPlutonium14.3 y

β⁻100.0%

α²³⁷U0.00%

²⁴¹AmAmericium433 y

α100.0%

²³⁷NpNeptunium2.14 My

α100.0%

30Mg²⁰⁷Tl4.00%

²³³PaProtactinium27.0 d

β⁻100.0%

²³³UUranium159 ky

α100.0%

24Ne²⁰⁹Pb7.20%

28Mg²⁰⁵Hg1.30%

²²⁹ThThorium7.92 ky

α100.0%

²²⁵RaRadium14.8 d

β⁻100.0%

²²⁵AcActinium9.92 d

α100.0%

¹⁴C²¹¹Bi5.30%

²²¹FrFrancium4.80 min

α100.0%

¹⁴C²⁰⁷Tl8.80%

β⁻²²¹Ra0.00%

²¹⁷AtAstatine32.6 ms

α100.0%

β⁻²¹⁷Rn0.01%

²¹³BiBismuth45.6 min

β⁻97.9%

α²⁰⁹Tl2.09%

²¹³PoPolonium3.71 μs

α100.0%

²⁰⁹PbLead3.23 h

β⁻100.0%

²⁰⁹BiBismuth20100000000 Gy

α100.0%

²⁰⁵TlThalliumSTABLE

20-step decay chain → stable · Primary path shown · branching ratios indicated

Other Isotopes of Americium

223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249

← Back to AmericiumData: IAEA NDS · ENSDF