You can search for things like...
- Vanadium
- Allotropes of Tellurium
- Gd (Symbol of Gadolinium)
- 116 (Atomic Number of Livermorium)
- Atomic Mass of Boron in lb
Fm
Fermium
19 known isotopes (0 stable,
19 radioactive)
241Fm
Mass
241.074311 u
Abundance —
Half-life 0.73 milliseconds
Spin/Parity —
Decay Mode(s) Spontaneous fission (78%), α (14%), Electron capture (12%)
242Fm
Mass
242.073430 u
Abundance —
Half-life 0.8 milliseconds
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (100%)
243Fm
Mass
243.074414 u
Abundance —
Half-life 231 milliseconds
Spin/Parity (7/2-)
Decay Mode(s) α (91%), EC/β⁺ (10%), Spontaneous fission (9%)
244Fm
Mass
244.074036 u
Abundance —
Half-life 3.12 milliseconds
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (97%), Electron capture (2%), α (1%)
245Fm
Mass
245.075354 u
Abundance —
Half-life 4.2 seconds
Spin/Parity —
Decay Mode(s) α (100%)
246Fm
Mass
246.075353 u
Abundance —
Half-life 1.54 seconds
Spin/Parity 0+
Decay Mode(s) α (93.2%), Spontaneous fission (6.8%), Electron capture (1.3%)
247Fm
Mass
247.076944 u
Abundance —
Half-life 31 seconds
Spin/Parity (7/2+)
Decay Mode(s) α (64%), EC/β⁺ (36%)
248Fm
Mass
248.077185 u
Abundance —
Half-life 34.5 seconds
Spin/Parity 0+
Decay Mode(s) α (95%), Electron capture (5%), Spontaneous fission (0.1%)
249Fm
Mass
249.078926 u
Abundance —
Half-life 2.6 m
Spin/Parity (7/2+)
Decay Mode(s) EC/β⁺ (67%), α (33%)
250Fm
Mass
250.079520 u
Abundance —
Half-life 30 m
Spin/Parity 0+
Decay Mode(s) α (90%), Electron capture (10%), Spontaneous fission (0.0069%)
251Fm
Mass
251.081545 u
Abundance —
Half-life 5.30 h
Spin/Parity (9/2-)
Decay Mode(s) EC/β⁺ (98.2%), α (1.8%)
252Fm
Mass
252.082466 u
Abundance —
Half-life 25.39 h
Spin/Parity 0+
Decay Mode(s) α (99.9977%), Spontaneous fission (0.0023%)
253Fm
Mass
253.085181 u
Abundance —
Half-life 3.00 d
Spin/Parity 1/2+
Decay Mode(s) Electron capture (88%), α (12%)
254Fm
Mass
254.086852 u
Abundance —
Half-life 3.240 h
Spin/Parity 0+
Decay Mode(s) α (99.9408%), Spontaneous fission (0.0592%)
255Fm
Mass
255.089963 u
Abundance —
Half-life 20.07 h
Spin/Parity 7/2+
Decay Mode(s) α (100%), Spontaneous fission (0.000024%)
256Fm
Mass
256.091772 u
Abundance —
Half-life 157.1 m
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (91.9%), α (8.1%)
257Fm
Mass
257.095105 u
Abundance —
Half-life 100.5 d
Spin/Parity (9/2+)
Decay Mode(s) α (99.79%), Spontaneous fission (0.21%)
258Fm
Mass
258.097077 u
Abundance —
Half-life 370 microseconds
Spin/Parity 0+
Decay Mode(s) Spontaneous fission (100%)
259Fm
Mass
259.100596 u
Abundance —
Half-life 1.5 seconds
Spin/Parity —
Decay Mode(s) Spontaneous fission (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
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
2
3
4
5
6
7