You can search for things like...

Tellurium
Neutron Cross Section of Terbium
Pm (Symbol of Promethium)
48 (Atomic Number of Cadmium)
Atomic Mass of Cesium in kg

Hf

Hafnium

Properties

Isotopes

Electrons

39 known isotopes (5 stable, 34 radioactive)

Show stable only

¹⁵¹Hf

Mass

— u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁵³Hf

Mass

152.970692 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

Unknown

¹⁵⁴Hf

Mass

153.964863 u

Abundance

—

Half-life

2 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%), α (0%)

¹⁵⁵Hf

Mass

154.963167 u

Abundance

—

Half-life

843 milliseconds

Spin/Parity

(7/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁵⁶Hf

Mass

155.959399 u

Abundance

—

Half-life

23 milliseconds

Spin/Parity

Decay Mode(s)

α (100%)

¹⁵⁷Hf

Mass

156.958288 u

Abundance

—

Half-life

115 milliseconds

Spin/Parity

(7/2-)

Decay Mode(s)

α (94%), EC/β⁺ (14%)

¹⁵⁸Hf

Mass

157.954801 u

Abundance

—

Half-life

2.85 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (55.7%), α (44.3%)

¹⁵⁹Hf

Mass

158.953996 u

Abundance

—

Half-life

5.6 seconds

Spin/Parity

7/2-

Decay Mode(s)

EC/β⁺ (65%), α (35%)

¹⁶⁰Hf

Mass

159.950683 u

Abundance

—

Half-life

13.6 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (99.3%), α (0.7%)

¹⁶¹Hf

Mass

160.950278 u

Abundance

—

Half-life

18.4 seconds

Spin/Parity

(7/2-)

Decay Mode(s)

EC/β⁺ (99.87%), α (0.13%)

¹⁶²Hf

Mass

161.947216 u

Abundance

—

Half-life

39.4 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (99.992%), α (0.008%)

¹⁶³Hf

Mass

162.947107 u

Abundance

—

Half-life

40.0 seconds

Spin/Parity

(5/2-)

Decay Mode(s)

EC/β⁺ (100%), α (0.0001%)

¹⁶⁴Hf

Mass

163.944371 u

Abundance

—

Half-life

111 seconds

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁵Hf

Mass

164.944567 u

Abundance

—

Half-life

76 seconds

Spin/Parity

(5/2-)

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁶Hf

Mass

165.942180 u

Abundance

—

Half-life

6.77 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁷Hf

Mass

166.942600 u

Abundance

—

Half-life

2.05 m

Spin/Parity

(5/2)-

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁸Hf

Mass

167.940568 u

Abundance

—

Half-life

25.95 m

Spin/Parity

Decay Mode(s)

EC/β⁺ (100%)

¹⁶⁹Hf

Mass

168.941259 u

Abundance

—

Half-life

3.24 m

Spin/Parity

5/2-

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁰Hf

Mass

169.939609 u

Abundance

—

Half-life

16.01 h

Spin/Parity

Decay Mode(s)

Electron capture (100%)

¹⁷¹Hf

Mass

170.940492 u

Abundance

—

Half-life

12.1 h

Spin/Parity

7/2(+)

Decay Mode(s)

EC/β⁺ (100%)

¹⁷²Hf

Mass

171.939450 u

Abundance

—

Half-life

1.87 years

Spin/Parity

Decay Mode(s)

Electron capture (100%)

¹⁷³Hf

Mass

172.940513 u

Abundance

—

Half-life

23.6 h

Spin/Parity

1/2-

Decay Mode(s)

EC/β⁺ (100%)

¹⁷⁴Hf

Mass

173.940048 u

Abundance

0.1600%

Half-life

2.0E+15 years

Spin/Parity

Decay Mode(s)

α (100%)

¹⁷⁵Hf

Mass

174.941511 u

Abundance

—

Half-life

70 d

Spin/Parity

5/2(-)

Decay Mode(s)

Electron capture (100%)

¹⁷⁶Hf Stable

Mass

175.941410 u

Abundance

5.2600%

Half-life

Stable

Spin/Parity

Decay Mode(s)

—

¹⁷⁷Hf Stable

Mass

176.943230 u

Abundance

18.6000%

Half-life

Stable

Spin/Parity

7/2-

Decay Mode(s)

—

¹⁷⁸Hf Stable

Mass

177.943708 u

Abundance

27.2800%

Half-life

Stable

Spin/Parity

Decay Mode(s)

—

¹⁷⁹Hf Stable

Mass

178.945826 u

Abundance

13.6200%

Half-life

Stable

Spin/Parity

9/2+

Decay Mode(s)

—

¹⁸⁰Hf Stable

Mass

179.946560 u

Abundance

35.0800%

Half-life

Stable

Spin/Parity

Decay Mode(s)

—

¹⁸¹Hf

Mass

180.949111 u

Abundance

—

Half-life

42.39 d

Spin/Parity

1/2-

Decay Mode(s)

β⁻ (100%)

¹⁸²Hf

Mass

181.950564 u

Abundance

—

Half-life

8.90E+6 years

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁸³Hf

Mass

182.953533 u

Abundance

—

Half-life

1.018 h

Spin/Parity

(3/2-)

Decay Mode(s)

Isomeric transition (100%), β⁻ (100%)

¹⁸⁴Hf

Mass

183.955449 u

Abundance

—

Half-life

4.12 h

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁸⁵Hf

Mass

184.958862 u

Abundance

—

Half-life

3.5 m

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁸⁶Hf

Mass

185.960897 u

Abundance

—

Half-life

2.6 m

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁸⁷Hf

Mass

186.964573 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁸⁸Hf

Mass

187.966903 u

Abundance

—

Half-life

Unknown

Spin/Parity

Decay Mode(s)

β⁻ (100%)

¹⁸⁹Hf

Mass

188.970853 u

Abundance

—

Half-life

Unknown

Spin/Parity

—

Decay Mode(s)

β⁻ (100%)

¹⁹⁰Hf

Mass

189.973376 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

Conversions Print

Name

Atomic Mass

Series

Metals

Nonmetals