Periodic Table/Radium/²⁰⁵Ra

← 204Ra206Ra →

²⁰⁵Ra

Radium-205

Radioactive· Half-life: 220 ms

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

88

Neutrons (N)

117

Mass Number (A)

205

Atomic Mass

205.006231AMU

Spin / Parity

3/2-

Binding E/A

7.488keV

Natural Abundance

Trace / None

Half-life

220 ms

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

α

100.0%

β⁺

Decay Chain

²⁰⁵RaRadium220 ms

α100.0%

β⁺²⁰⁵Fr

²⁰¹RnRadon7.00 s

α

β⁺²⁰¹At

¹⁹⁷PoPolonium53.6 s

α44.0%

β⁺¹⁹⁷Bi

β⁺

¹⁹³TlThallium21.6 min

β⁺100.0%

¹⁹³HgMercury3.80 h

β⁺100.0%

¹⁹³AuGold17.6 h

β⁺100.0%

α¹⁸⁹Ir

¹⁹³PtPlatinum50.0 y

EC100.0%

¹⁹³IrIridiumSTABLE

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

Other Isotopes of Radium

201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235

← Back to RadiumData: IAEA NDS · ENSDF