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Properties of substance:

mendelevium

Group of substances:

inorganic

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

Md

Structural formula as text:

Md

Molar/atomic mass: 258

Melting point (°C):

827

CAS №: 7440-11-1

Numerical data:

Year of discovery: 1955

Half-life:

245101Md = 0.9 ms (spontaneous fission)
245m101Md = about 0.4 s (α)
246101Md = 1 s (α)
247101Md = 3 s (α)
247m101Md = about 0.2 s (spontaneous fission)
248101Md = 7 s (electron capture (80%); α (20%))
249101Md = 24 s (electron capture (80%); α (20%))
250101Md = 50 s (electron capture (94%); α (6%))
251101Md = 4 min (electron capture (94%); α (6%))
252101Md = 2 min (electron capture (50%); α (50%))
253101Md = about 6 min (electron capture)
254101Md = 10 min (electron capture)
254m101Md = 30 min (electron capture)
255101Md = 27 min (electron capture (92%); α (8%))
256101Md = 1.3 h (electron capture (89%); α (11%))
257101Md = 5.5 h (electron capture (85%); α (15%))
258101Md = 51.5 d (α)
258m101Md = 57 min (electron capture; spontaneous fission)
259101Md = 1.64 h (spontaneous fission (98.7%); α (1.3%))
260101Md = about 27.8 d (spontaneous fission)

Electrode potential:

Md3+ + 3e- → Md, E = -1.74 V (water, 25°C)

References:

  1. Handbook of Chemistry and Physics. - CRC Press, Inc., 2002. - pp. 1-13, 1-195 - 1-196
  2. Гринвуд Н., Эрншо А. Химия элементов. - Т.2. - М.: БИНОМ. Лаборатория знаний, 2008. - pp. 581, 594 [Russian]
  3. Химия актиноидов. - Т.2. - М.: Мир, 1997. - pp. 629-633 [Russian]

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    © Collected Ruslan Anatolievich Kiper, burewestnik@mail.ru