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Nihonium
Heat of Arsenic
Na (Symbol of Sodium)
13 (Atomic Number of Aluminum)
Electron Affinity of Mendelevium in kcal/mol

Fr

Francium

Properties

Isotopes

Electrons

37 known isotopes (0 stable, 37 radioactive)

Show stable only

¹⁹⁷Fr

Mass

197.011008 u

Abundance

—

Half-life

0.6 milliseconds

Spin/Parity

(7/2-)

Decay Mode(s)

α (100%)

¹⁹⁸Fr

Mass

198.010282 u

Abundance

—

Half-life

15 milliseconds

Spin/Parity

—

Decay Mode(s)

α (100%)

¹⁹⁹Fr

Mass

199.007269 u

Abundance

—

Half-life

12 milliseconds

Spin/Parity

—

Decay Mode(s)

α (0%)

²⁰⁰Fr

Mass

200.006585 u

Abundance

—

Half-life

49 milliseconds

Spin/Parity

(3+)

Decay Mode(s)

α (100%)

²⁰¹Fr

Mass

201.003852 u

Abundance

—

Half-life

63 milliseconds

Spin/Parity

9/2-

Decay Mode(s)

α (100%)

²⁰²Fr

Mass

202.003330 u

Abundance

—

Half-life

0.30 seconds

Spin/Parity

(3+)

Decay Mode(s)

α (100%)

²⁰³Fr

Mass

203.000941 u

Abundance

—

Half-life

0.55 seconds

Spin/Parity

9/2-

Decay Mode(s)

α (100%)

²⁰⁴Fr

Mass

204.000652 u

Abundance

—

Half-life

1.8 seconds

Spin/Parity

(3+)

Decay Mode(s)

α (92%), EC/β⁺ (8%)

²⁰⁵Fr

Mass

204.998594 u

Abundance

—

Half-life

3.90 seconds

Spin/Parity

9/2-

Decay Mode(s)

α (98.5%), EC/β⁺ (1.5%)

²⁰⁶Fr

Mass

205.998661 u

Abundance

—

Half-life

16 seconds

Spin/Parity

(2+ 3+)

Decay Mode(s)

α (84%), Electron capture (16%)

²⁰⁷Fr

Mass

206.996941 u

Abundance

—

Half-life

14.8 seconds

Spin/Parity

9/2-

Decay Mode(s)

α (95%), EC/β⁺ (5%)

²⁰⁸Fr

Mass

207.997139 u

Abundance

—

Half-life

59.1 seconds

Spin/Parity

Decay Mode(s)

α (89%), EC/β⁺ (11%)

²⁰⁹Fr

Mass

208.995940 u

Abundance

—

Half-life

50.5 seconds

Spin/Parity

9/2-

Decay Mode(s)

α (89%), EC/β⁺ (11%)

²¹⁰Fr

Mass

209.996411 u

Abundance

—

Half-life

3.18 m

Spin/Parity

Decay Mode(s)

α (60%), EC/β⁺ (40%)

²¹¹Fr

Mass

210.995555 u

Abundance

—

Half-life

3.10 m

Spin/Parity

9/2-

Decay Mode(s)

α (80%), Electron capture (20%)

²¹²Fr

Mass

211.996225 u

Abundance

—

Half-life

20.0 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (57%), α (43%)

²¹³Fr

Mass

212.996184 u

Abundance

—

Half-life

34.17 seconds

Spin/Parity

9/2-

Decay Mode(s)

α (99.44%), EC/β⁺ (0.56%)

²¹⁴Fr

Mass

213.998971 u

Abundance

—

Half-life

5.5 milliseconds

Spin/Parity

(1-)

Decay Mode(s)

α (100%)

²¹⁵Fr

Mass

215.000342 u

Abundance

—

Half-life

86 nanoseconds

Spin/Parity

9/2-

Decay Mode(s)

α (100%)

²¹⁶Fr

Mass

216.003190 u

Abundance

—

Half-life

0.70 microseconds

Spin/Parity

(1-)

Decay Mode(s)

α (100%), Electron capture (2e-7%)

²¹⁷Fr

Mass

217.004632 u

Abundance

—

Half-life

22 microseconds

Spin/Parity

9/2-

Decay Mode(s)

α (100%)

²¹⁸Fr

Mass

218.007579 u

Abundance

—

Half-life

1.1 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

²¹⁹Fr

Mass

219.009251 u

Abundance

—

Half-life

24 milliseconds

Spin/Parity

9/2-

Decay Mode(s)

α (100%)

²²⁰Fr

Mass

220.012327 u

Abundance

—

Half-life

27.4 seconds

Spin/Parity

Decay Mode(s)

α (99.65%), β⁻ (0.35%)

²²¹Fr

Mass

221.014254 u

Abundance

—

Half-life

4.9 m

Spin/Parity

5/2-

Decay Mode(s)

α (100%), β⁻ (0.1%)

²²²Fr

Mass

222.017583 u

Abundance

—

Half-life

14.2 m

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²²³Fr

Mass

223.019734 u

Abundance

—

Half-life

22.00 m

Spin/Parity

3/2(-)

Decay Mode(s)

β⁻ (99.994%), α (0.006%)

²²⁴Fr

Mass

224.023348 u

Abundance

—

Half-life

3.33 m

Spin/Parity

1(-)

Decay Mode(s)

β⁻ (100%)

²²⁵Fr

Mass

225.025572 u

Abundance

—

Half-life

3.95 m

Spin/Parity

3/2-

Decay Mode(s)

β⁻ (100%)

²²⁶Fr

Mass

226.029545 u

Abundance

—

Half-life

49 seconds

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²²⁷Fr

Mass

227.031865 u

Abundance

—

Half-life

2.47 m

Spin/Parity

1/2+

Decay Mode(s)

β⁻ (100%)

²²⁸Fr

Mass

228.035839 u

Abundance

—

Half-life

38 seconds

Spin/Parity

Decay Mode(s)

β⁻ (100%)

²²⁹Fr

Mass

229.038291 u

Abundance

—

Half-life

50.2 seconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

²³⁰Fr

Mass

230.042391 u

Abundance

—

Half-life

19.1 seconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

²³¹Fr

Mass

231.045175 u

Abundance

—

Half-life

17.6 seconds

Spin/Parity

(1/2+)

Decay Mode(s)

β⁻ (100%)

²³²Fr

Mass

232.049461 u

Abundance

—

Half-life

5.5 seconds

Spin/Parity

(5)

Decay Mode(s)

β⁻ (100%)

²³³Fr

Mass

233.052518 u

Abundance

—

Half-life

0.9 seconds

Spin/Parity

(1/2+)

Decay Mode(s)

β⁻ (100%)

Decay mode abbreviations:

β⁻ = Beta minus decay, β⁺ = Beta plus decay, EC = Electron capture, α = Alpha decay

n = Neutron emission, p = Proton emission, SF = Spontaneous fission, IT = Isomeric transition

Conversions Print

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