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Gallium
Neutron Mass Absorption of Boron
Ra (Symbol of Radium)
8 (Atomic Number of Oxygen)
Electron Affinity of Platinum in kcal/mol

I

Iodine

Properties

Isotopes

Electrons

40 known isotopes (1 stable, 39 radioactive)

Show stable only

¹⁰⁸I

Mass

107.943348 u

Abundance

—

Half-life

36 milliseconds

Spin/Parity

(1)

Decay Mode(s)

α (91%), EC/β⁺ (9%), Proton emission (1%)

¹⁰⁹I

Mass

108.938086 u

Abundance

—

Half-life

92.8 microseconds

Spin/Parity

(1/2+ 3/2+)

Decay Mode(s)

Proton emission (99.986%), α (0.014%)

¹¹⁰I

Mass

109.935085 u

Abundance

—

Half-life

0.664 seconds

Spin/Parity

(1+)

Decay Mode(s)

EC/β⁺ (83%), α (17%), ECP (11%)

¹¹¹I

Mass

110.930269 u

Abundance

—

Half-life

2.5 seconds

Spin/Parity

(5/2+)

Decay Mode(s)

EC/β⁺ (99.9%), α (0.1%)

¹¹²I

Mass

111.928005 u

Abundance

—

Half-life

3.34 seconds

Spin/Parity

(1+)

Decay Mode(s)

EC/β⁺ (100%), ECP (0.88%), ECA (0.104%)

¹¹³I

Mass

112.923650 u

Abundance

—

Half-life

6.6 seconds

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%), α (3.31e-7%)

¹¹⁴I

Mass

113.922019 u

Abundance

—

Half-life

2.1 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹¹⁵I

Mass

114.918048 u

Abundance

—

Half-life

1.3 m

Spin/Parity

(5/2+)

Decay Mode(s)

EC/β⁺ (100%)

¹¹⁶I

Mass

115.916886 u

Abundance

—

Half-life

2.91 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹¹⁷I

Mass

116.913646 u

Abundance

—

Half-life

2.22 m

Spin/Parity

(5/2)+

Decay Mode(s)

EC/β⁺ (100%), β⁺ (77%)

¹¹⁸I

Mass

117.913074 u

Abundance

—

Half-life

13.7 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹¹⁹I

Mass

118.910061 u

Abundance

—

Half-life

19.1 m

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%), β⁺ (51%), Electron capture (49%)

¹²⁰I

Mass

119.910094 u

Abundance

—

Half-life

81.6 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹²¹I

Mass

120.907411 u

Abundance

—

Half-life

2.12 h

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%)

¹²²I

Mass

121.907590 u

Abundance

—

Half-life

3.63 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹²³I

Mass

122.905590 u

Abundance

—

Half-life

13.2230 h

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%)

¹²⁴I

Mass

123.906210 u

Abundance

—

Half-life

4.1760 d

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹²⁵I

Mass

124.904631 u

Abundance

—

Half-life

59.407 d

Spin/Parity

5/2+

Decay Mode(s)

Electron capture (100%)

¹²⁶I

Mass

125.905624 u

Abundance

—

Half-life

12.93 d

Spin/Parity

Decay Mode(s)

EC/β⁺ (52.7%), β⁻ (47.3%)

¹²⁷I Stable

Mass

126.904473 u

Abundance

100.0000%

Half-life

Stable

Spin/Parity

5/2+

Decay Mode(s)

—

¹²⁸I

Mass

127.905809 u

Abundance

—

Half-life

24.99 m

Spin/Parity

Decay Mode(s)

β⁻ (93.1%), EC/β⁺ (6.9%)

¹²⁹I

Mass

128.904984 u

Abundance

—

Half-life

1.57E+7 years

Spin/Parity

7/2+

Decay Mode(s)

β⁻ (100%)

¹³⁰I

Mass

129.906670 u

Abundance

—

Half-life

12.36 h

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹³¹I

Mass

130.906126 u

Abundance

—

Half-life

8.0252 d

Spin/Parity

7/2+

Decay Mode(s)

β⁻ (100%)

¹³²I

Mass

131.907994 u

Abundance

—

Half-life

2.295 h

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹³³I

Mass

132.907828 u

Abundance

—

Half-life

20.83 h

Spin/Parity

7/2+

Decay Mode(s)

β⁻ (100%)

¹³⁴I

Mass

133.909776 u

Abundance

—

Half-life

52.5 m

Spin/Parity

(4)+

Decay Mode(s)

β⁻ (100%)

¹³⁵I

Mass

134.910059 u

Abundance

—

Half-life

6.58 h

Spin/Parity

7/2+

Decay Mode(s)

β⁻ (100%)

¹³⁶I

Mass

135.914605 u

Abundance

—

Half-life

83.4 seconds

Spin/Parity

(1-)

Decay Mode(s)

β⁻ (100%)

¹³⁷I

Mass

136.918028 u

Abundance

—

Half-life

24.5 seconds

Spin/Parity

(7/2+)

Decay Mode(s)

β⁻ (100%), β⁻n (7.14%)

¹³⁸I

Mass

137.922726 u

Abundance

—

Half-life

6.26 seconds

Spin/Parity

(1-)

Decay Mode(s)

β⁻ (100%), β⁻n (5.44%)

¹³⁹I

Mass

138.926493 u

Abundance

—

Half-life

2.280 seconds

Spin/Parity

(7/2+)

Decay Mode(s)

β⁻ (100%), β⁻n (10%)

¹⁴⁰I

Mass

139.931716 u

Abundance

—

Half-life

0.86 seconds

Spin/Parity

(4-)

Decay Mode(s)

β⁻ (100%), β⁻n (7.6%)

¹⁴¹I

Mass

140.935666 u

Abundance

—

Half-life

0.418 seconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%), β⁻n (21.2%)

¹⁴²I

Mass

141.941167 u

Abundance

—

Half-life

222 milliseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁴³I

Mass

142.945475 u

Abundance

—

Half-life

130 milliseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁴⁴I

Mass

143.951336 u

Abundance

—

Half-life

300 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁴⁵I

Mass

144.955845 u

Abundance

—

Half-life

407 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁴⁶I

Mass

145.961846 u

Abundance

—

Half-life

94 milliseconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁴⁷I

Mass

146.966505 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

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

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