Main page (Russian) Search in database (English)

Properties of substance:

fermium

Group of substances:

inorganic

Empirical formula (Hill's system for organic substances):

Fm

Structural formula as text:

Fm

Molar/atomic mass: 257

Melting point (°C):

1527

Numerical data:

Year of discovery: 1952

Half-life:

243100Fm = 0.18 s (α)
244100Fm = 3.7 ms (spontaneous fission)
245100Fm = 4.2 s (α)
246100Fm = 1.1 s (α (92%), spontaneous fission (8%))
247100Fm = 35 s (α. electron capture)
248100Fm = 36 s (α (99.9%), spontaneous fission (0.1%))
249100Fm = 2.6 min (α)
250100Fm = 30 min (α)
251100Fm = 5.3 hasа (electron capture (98.2%), α (1.8%))
252100Fm = 25.39 h (α. spontaneous fission)
253100Fm = 3 d (electron capture (88%), α (12%))
254100Fm = 3.24 h (α. spontaneous fission)
255100Fm = 20.07 h (α. spontaneous fission)
256100Fm = 157.6 min (spontaneous fission (91.9%), α (8.1%))
257100Fm = 100.5 d (α (99.79%), spontaneous fission (0.21%))
258100Fm = 380 μs (spontaneous fission)
259100Fm = 1.5 s (spontaneous fission)

Electrode potential:

Fm3+ + 3e- → Fm, E = -2.07 V (water, 25°C)
Fm4+ + e- → Fm3+, E = 5.2 V (water, 25°C)

References:

  1. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 581 [Russian]
  2. Химическая энциклопедия. - Т. 5. - М.: Советская энциклопедия, 1999. - pp. 84 [Russian]
  3. Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 623-627 [Russian]

    What information do you need?




    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru