mendelevium

E47604

actinide chemical element radioactive element synthetic element

Mendelevium is a synthetic, radioactive actinide element with atomic number 101, named after Dmitri Mendeleev and produced only in particle accelerators.

Statements (47)

Predicate	Object
instanceOf	actinide → chemical element → radioactive element → synthetic element →
atomicNumber	101 →
atomicRadiusPm	around 173 →
belongsToSeries	transuranium elements →
block	f-block →
CASNumber	7440-11-1 →
chemicalSymbol	Md →
discoveredAt	Lawrence Berkeley National Laboratory →
discoveredInCountry	United States →
discoverer	Albert Ghiorso → Bernard G. Harvey NERFINISHED → Glenn T. Seaborg → Gregory R. Choppin → Stanley G. Thompson NERFINISHED →
discoveryYear	1955 →
electronConfiguration	[Rn] 5f13 7s2 →
elementCategory	actinide →
firstSynthesisReactionType	alpha-particle bombardment →
firstSynthesisTarget	einsteinium-253 →
group	actinide series →
hasNoStableIsotopes	yes →
isotopesCountKnown	more than 15 isotopes →
isTransuranic	yes →
IUPACName	mendelevium →
meltingPointCelsius	about 827 →
meltingPointKelvin	1100 →
mostStableIsotope	mendelevium-258 →
mostStableIsotopeHalfLife	about 51.5 days →
namedAfter	Dmitri Mendeleev →
namedForContribution	periodic table development →
occursNaturally	no →
oxidationState	+2 → +3 →
period	7 →
phaseAtSTP	solid →
positionInPeriodicTable	between fermium and nobelium →
primaryOxidationStateInSolution	+3 →
producedBy	particle accelerators →
radioactive	yes →
secondaryOxidationStateInSolution	+2 →
standardAtomicWeight	[258] →
symbolOrigin	derived from name mendelevium →
syntheticProductionMethod	heavy-ion bombardment →
Z	101 →

Referenced by (3)

Subject (surface form when different)	Predicate
Glenn T. Seaborg → Lawrence Berkeley National Laboratory →	discovered
mendelevium →	IUPACName