Periodic Table/Americium/²²⁸Am

← 227Am229Am →

²²⁸Am

Americium-228

Radioactive

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

95

Neutrons (N)

133

Mass Number (A)

228

Atomic Mass

228.046001AMU

Spin / Parity

—

Binding E/A

7.345keV

Natural Abundance

Trace / None

Half-life

Unknown

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

α

SF

Decay Chain

²²⁸AmAmericium?

α

²²⁴NpNeptunium48.0 μs

α100.0%

²²⁰PaProtactinium850 ns

α100.0%

β⁺²²⁰Th

²¹⁶AcActinium440 μs

α100.0%

β⁺²¹⁶Ra

²¹²FrFrancium20.0 min

β⁺57.0%

α²⁰⁸At43.0%

²¹²RnRadon23.9 min

α100.0%

²⁰⁸PoPolonium2.90 y

α100.0%

β⁺²⁰⁸Bi0.00%

²⁰⁴PbLeadSTABLE

8-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