Periodic Table/Radium/²²²Ra

← 221Ra223Ra →

²²²Ra

Radium-222

Radioactive· Half-life: 33.6 s

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

88

Neutrons (N)

134

Mass Number (A)

222

Atomic Mass

222.015373AMU

Spin / Parity

0+

Binding E/A

7.494keV

Natural Abundance

Trace / None

Half-life

33.6 s

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

α

100.0%

¹⁴C

3.0%

Decay Chain

²²²RaRadium33.6 s

α100.0%

¹⁴C²⁰⁸Pb3.00%

²¹⁸RnRadon33.8 ms

α100.0%

²¹⁴PoPolonium163 μs

α100.0%

²¹⁰PbLead22.2 y

β⁻100.0%

α²⁰⁶Hg1.90%

²¹⁰BiBismuth5.01 d

β⁻100.0%

α²⁰⁶Tl13.2%

²¹⁰PoPolonium138 d

α100.0%

²⁰⁶PbLeadSTABLE

7-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

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