Sb
Metalloid
Antimony
Z 51A 122mass 121.76
Slow-motion stage
Antimony-122
proton
neutron
electron (β⁻)
Parent nucleus · 122 nucleons
51 protons (coral) and 71 neutrons (blue) are packed together and held by the strong force.
A real decay takes about 10⁻²¹ s. At ⅓× this stage stretches it across eleven seconds.
Choose a reaction
Reaction
12251Sb12252Te+β⁻+ ν̄
A neutron turns into a proton. An electron and an antineutrino fly out.
Z
5152
+1
A
122122
no change
n⁰
7170
-1
Energy released
0.900MeVtypical value
Electron (max)0.900 MeV
Mass convertedE = Δm c²0.00097 u
In joules1.44 × 10-13 J
Compared with a bonda C–C bond is 3.6 eV≈ 250,000 ×
Measured beta energies fall between 0.02 and 3 MeV.
The particle
- Charge
- −1
- Mass
- 1/1836 u
- Speed
- Up to 99.9% of the speed of light
- Ionising power
- Moderate
- Stopped by
- A few millimetres of aluminium