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Chlorine
Gas Phase of Uranium
Rg (Symbol of Roentgenium)
16 (Atomic Number of Sulfur)
Boiling Point of Sodium in °F

Ta

Tantalum

Properties

Isotopes

Electrons

40 known isotopes (1 stable, 39 radioactive)

Show stable only

¹⁵⁵Ta

Mass

154.974248 u

Abundance

—

Half-life

2.9 milliseconds

Spin/Parity

11/2-

Decay Mode(s)

Proton emission (100%)

¹⁵⁶Ta

Mass

155.972087 u

Abundance

—

Half-life

106 milliseconds

Spin/Parity

(2-)

Decay Mode(s)

Proton emission (71%), EC/β⁺ (29%)

¹⁵⁷Ta

Mass

156.968227 u

Abundance

—

Half-life

10.1 milliseconds

Spin/Parity

1/2+

Decay Mode(s)

α (96.6%), Proton emission (3.4%)

¹⁵⁸Ta

Mass

157.966593 u

Abundance

—

Half-life

55 milliseconds

Spin/Parity

(2-)

Decay Mode(s)

α (91%), EC/β⁺ (9%)

¹⁵⁹Ta

Mass

158.963028 u

Abundance

—

Half-life

0.83 seconds

Spin/Parity

1/2+

Decay Mode(s)

EC/β⁺ (66%), α (34%)

¹⁶⁰Ta

Mass

159.961542 u

Abundance

—

Half-life

1.55 seconds

Spin/Parity

—

Decay Mode(s)

α (34%)

¹⁶¹Ta

Mass

160.958369 u

Abundance

—

Half-life

Unknown

Spin/Parity

(1/2+)

Decay Mode(s)

Unknown

¹⁶²Ta

Mass

161.957293 u

Abundance

—

Half-life

3.57 seconds

Spin/Parity

—

Decay Mode(s)

EC/β⁺ (99.926%), α (0.074%)

¹⁶³Ta

Mass

162.954337 u

Abundance

—

Half-life

10.6 seconds

Spin/Parity

—

Decay Mode(s)

EC/β⁺ (99.8%), α (0.2%)

¹⁶⁴Ta

Mass

163.953534 u

Abundance

—

Half-life

14.2 seconds

Spin/Parity

(3+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁵Ta

Mass

164.950780 u

Abundance

—

Half-life

31.0 seconds

Spin/Parity

(9/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁶Ta

Mass

165.950512 u

Abundance

—

Half-life

34.4 seconds

Spin/Parity

(2)+

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁷Ta

Mass

166.948093 u

Abundance

—

Half-life

80 seconds

Spin/Parity

(3/2+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁸Ta

Mass

167.948047 u

Abundance

—

Half-life

2.0 m

Spin/Parity

(2- 3+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁹Ta

Mass

168.946011 u

Abundance

—

Half-life

4.9 m

Spin/Parity

(5/2+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁰Ta

Mass

169.946175 u

Abundance

—

Half-life

6.76 m

Spin/Parity

(3+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁷¹Ta

Mass

170.944476 u

Abundance

—

Half-life

23.3 m

Spin/Parity

(5/2+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁷²Ta

Mass

171.944895 u

Abundance

—

Half-life

36.8 m

Spin/Parity

(3+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁷³Ta

Mass

172.943750 u

Abundance

—

Half-life

3.14 h

Spin/Parity

5/2-

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁴Ta

Mass

173.944454 u

Abundance

—

Half-life

1.14 h

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁵Ta

Mass

174.943737 u

Abundance

—

Half-life

10.5 h

Spin/Parity

7/2+

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁶Ta

Mass

175.944857 u

Abundance

—

Half-life

8.09 h

Spin/Parity

(1)-

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁷Ta

Mass

176.944482 u

Abundance

—

Half-life

56.36 h

Spin/Parity

7/2+

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁸Ta

Mass

177.945680 u

Abundance

—

Half-life

2.36 h

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁹Ta

Mass

178.945939 u

Abundance

—

Half-life

1.82 years

Spin/Parity

7/2+

Decay Mode(s)

Electron capture (100%)

¹⁸⁰Ta

Mass

179.947468 u

Abundance

—

Half-life

8.154 h

Spin/Parity

Decay Mode(s)

Electron capture (85%), β⁻ (15%)

¹⁸¹Ta Stable

Mass

180.947999 u

Abundance

99.9880%

Half-life

Stable

Spin/Parity

7/2+

Decay Mode(s)

—

¹⁸²Ta

Mass

181.950155 u

Abundance

—

Half-life

114.74 d

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁸³Ta

Mass

182.951375 u

Abundance

—

Half-life

5.1 d

Spin/Parity

7/2+

Decay Mode(s)

β⁻ (100%)

¹⁸⁴Ta

Mass

183.954010 u

Abundance

—

Half-life

8.7 h

Spin/Parity

(5-)

Decay Mode(s)

β⁻ (100%)

¹⁸⁵Ta

Mass

184.955561 u

Abundance

—

Half-life

49.4 m

Spin/Parity

(7/2+)

Decay Mode(s)

β⁻ (100%)

¹⁸⁶Ta

Mass

185.958553 u

Abundance

—

Half-life

10.39 m

Spin/Parity

(3-)

Decay Mode(s)

β⁻ (100%)

¹⁸⁷Ta

Mass

186.960391 u

Abundance

—

Half-life

283 seconds

Spin/Parity

(7/2+)

Decay Mode(s)

β⁻ (100%)

¹⁸⁸Ta

Mass

187.963596 u

Abundance

—

Half-life

19.6 seconds

Spin/Parity

(1-)

Decay Mode(s)

β⁻ (100%)

¹⁸⁹Ta

Mass

188.965690 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁹⁰Ta

Mass

189.969168 u

Abundance

—

Half-life

5.3 seconds

Spin/Parity

(3)

Decay Mode(s)

β⁻ (100%)

¹⁹¹Ta

Mass

190.971530 u

Abundance

—

Half-life

300 nanoseconds

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁹²Ta

Mass

191.975201 u

Abundance

—

Half-life

2.2 seconds

Spin/Parity

(1 2)

Decay Mode(s)

β⁻ (100%)

¹⁹³Ta

Mass

192.977660 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁹⁴Ta

Mass

193.981610 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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