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Californium
Lifetime of Cerium
H (Symbol of Hydrogen)
9 (Atomic Number of Fluorine)
Superconducting Point of Roentgenium in °C

Ho

Holmium

Properties

Isotopes

Electrons

39 known isotopes (1 stable, 38 radioactive)

Show stable only

¹⁴⁰Ho

Mass

139.968526 u

Abundance

—

Half-life

6 milliseconds

Spin/Parity

(6- 0- 8+)

Decay Mode(s)

Proton emission (100%)

¹⁴¹Ho

Mass

140.963108 u

Abundance

—

Half-life

4.1 milliseconds

Spin/Parity

(7/2-)

Decay Mode(s)

Proton emission (100%)

¹⁴²Ho

Mass

141.960010 u

Abundance

—

Half-life

0.4 seconds

Spin/Parity

(7- 8+)

Decay Mode(s)

EC/β⁺ (100%), ECP (0%), Proton emission (0%)

¹⁴³Ho

Mass

142.954860 u

Abundance

—

Half-life

Unknown

Spin/Parity

(11/2-)

Decay Mode(s)

Unknown

¹⁴⁴Ho

Mass

143.952110 u

Abundance

—

Half-life

0.7 seconds

Spin/Parity

(5-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁴⁵Ho

Mass

144.947267 u

Abundance

—

Half-life

2.4 seconds

Spin/Parity

(11/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁴⁶Ho

Mass

145.944994 u

Abundance

—

Half-life

3.32 seconds

Spin/Parity

(6-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁴⁷Ho

Mass

146.940142 u

Abundance

—

Half-life

5.8 seconds

Spin/Parity

(11/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁴⁸Ho

Mass

147.937744 u

Abundance

—

Half-life

2.2 seconds

Spin/Parity

(1+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁴⁹Ho

Mass

148.933820 u

Abundance

—

Half-life

21.0 seconds

Spin/Parity

(11/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁰Ho

Mass

149.933498 u

Abundance

—

Half-life

72 seconds

Spin/Parity

(2)-

Decay Mode(s)

EC/β⁺ (100%)

¹⁵¹Ho

Mass

150.931698 u

Abundance

—

Half-life

35.2 seconds

Spin/Parity

(11/2-)

Decay Mode(s)

EC/β⁺ (78%), α (22%)

¹⁵²Ho

Mass

151.931718 u

Abundance

—

Half-life

161.8 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (88%), α (12%)

¹⁵³Ho

Mass

152.930207 u

Abundance

—

Half-life

2.01 m

Spin/Parity

11/2-

Decay Mode(s)

EC/β⁺ (99.949%), α (0.051%)

¹⁵⁴Ho

Mass

153.930607 u

Abundance

—

Half-life

11.76 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (99.981%), α (0.019%)

¹⁵⁵Ho

Mass

154.929103 u

Abundance

—

Half-life

48 m

Spin/Parity

5/2+

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁶Ho

Mass

155.929642 u

Abundance

—

Half-life

56 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁷Ho

Mass

156.928252 u

Abundance

—

Half-life

12.6 m

Spin/Parity

7/2-

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁸Ho

Mass

157.928945 u

Abundance

—

Half-life

11.3 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁹Ho

Mass

158.927719 u

Abundance

—

Half-life

33.05 m

Spin/Parity

7/2-

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁰Ho

Mass

159.928736 u

Abundance

—

Half-life

25.6 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁶¹Ho

Mass

160.927862 u

Abundance

—

Half-life

2.48 h

Spin/Parity

7/2-

Decay Mode(s)

Electron capture (100%)

¹⁶²Ho

Mass

161.929103 u

Abundance

—

Half-life

15.0 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁶³Ho

Mass

162.928740 u

Abundance

—

Half-life

4570 years

Spin/Parity

7/2-

Decay Mode(s)

Electron capture (100%)

¹⁶⁴Ho

Mass

163.930241 u

Abundance

—

Half-life

28.8 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (60%), β⁻ (40%)

¹⁶⁵Ho Stable

Mass

164.930329 u

Abundance

100.0000%

Half-life

Stable

Spin/Parity

7/2-

Decay Mode(s)

—

¹⁶⁶Ho

Mass

165.932291 u

Abundance

—

Half-life

26.824 h

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁶⁷Ho

Mass

166.933140 u

Abundance

—

Half-life

3.1 h

Spin/Parity

7/2-

Decay Mode(s)

β⁻ (100%)

¹⁶⁸Ho

Mass

167.935524 u

Abundance

—

Half-life

2.99 m

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁶⁹Ho

Mass

168.936880 u

Abundance

—

Half-life

4.72 m

Spin/Parity

7/2-

Decay Mode(s)

β⁻ (100%)

¹⁷⁰Ho

Mass

169.939627 u

Abundance

—

Half-life

2.76 m

Spin/Parity

(6+)

Decay Mode(s)

β⁻ (100%)

¹⁷¹Ho

Mass

170.941473 u

Abundance

—

Half-life

53 seconds

Spin/Parity

(7/2-)

Decay Mode(s)

β⁻ (100%)

¹⁷²Ho

Mass

171.944730 u

Abundance

—

Half-life

25 seconds

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁷³Ho

Mass

172.947020 u

Abundance

—

Half-life

6.9 seconds

Spin/Parity

(7/2-)

Decay Mode(s)

β⁻ (100%)

¹⁷⁴Ho

Mass

173.950757 u

Abundance

—

Half-life

3.2 seconds

Spin/Parity

(8-)

Decay Mode(s)

β⁻ (100%)

¹⁷⁵Ho

Mass

174.953516 u

Abundance

—

Half-life

1.9 seconds

Spin/Parity

(7/2-)

Decay Mode(s)

β⁻ (100%)

¹⁷⁶Ho

Mass

175.957713 u

Abundance

—

Half-life

160 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁷⁷Ho

Mass

176.961052 u

Abundance

—

Half-life

Unknown

Spin/Parity

(7/2-)

Decay Mode(s)

β⁻ (100%)

¹⁷⁸Ho

Mass

177.965507 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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