Periodic Table/Radon/²²¹Rn

← 220Rn222Rn →

²²¹Rn

Radon-221

Radioactive· Half-life: 25.7 min

Nuclear Propertiesbinding energy · spin-parity · abundance

Protons (Z)

86

Neutrons (N)

135

Mass Number (A)

221

Atomic Mass

221.015536AMU

Spin / Parity

7/2+

Binding E/A

7.503keV

Natural Abundance

Trace / None

Half-life

25.7 min

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

β⁻

78.0%

α

22.0%

Decay Chain

²²¹RnRadon25.7 min

β⁻78.0%

α²¹⁷Po22.0%

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

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

Other Isotopes of Radon

193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231

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