mendelevium

Also known as Md, element 101, Unu, unnilunium, 101Md, Mv

Mendelevium is a synthetic chemical element; it has symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranium element in the actinide series, it is the first element by atomic number that currently cannot be produced in macroscopic quantities by neutron bombardment of lighter elements. It is the thirteenth actinide, the ninth transuranic element, and the first transfermium; it is named after Dmitri Mendeleev, the father of the periodic table.

AI overview

Mendelevium is a synthetic element created in laboratories with atomic number 101 that exists only in microscopic amounts and belongs to the actinide series of the periodic table. It is notable as the first element that cannot be made in practical quantities through standard nuclear bombardment methods, and it was named after Dmitri Mendeleev in honor of his pioneering work organizing the periodic table.

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Chemical data

Formula: Md
Molecular weight: 258.09843 g/mol
IUPAC name: mendelevium
SMILES: [Md]
InChIKey: MQVSLOYRCXQRPM-UHFFFAOYSA-N
Polar surface area: 0 Å²
H-bond donors: 0
H-bond acceptors: 0
Formal charge: 0

via PubChem

Research

5 papers

Mendelevium 101.Nature chemistry · 2019Pichon ADOI: 10.1038/s41557-019-0227-8
Mendelevium: divalency and other chemical properties.Science (New York, N.Y.) · 1967Hulet EK, Lougheed RW, Brady JD et al.DOI: 10.1126/science.158.3800.486
Investigation of the solvent extraction of californium, fermium and mendelevium.Talanta · 1966Gavrilov KA, Gvuzdz E, Starý J et al.DOI: 10.1016/0039-9140(66)80065-6
Measurement of the Md3+/Md2+ reduction potential studied with flow electrolytic chromatography.Inorganic chemistry · 2013Toyoshima A, Li Z, Asai M et al.DOI: 10.1021/ic401571h
First Ionization Potentials of Fm, Md, No, and Lr: Verification of Filling-Up of 5f Electrons and Confirmation of the Actinide Series.Journal of the American Chemical Society · 2018Sato TK, Asai M, Borschevsky A et al.DOI: 10.1021/jacs.8b09068

via PubMed

Wikidata facts

Image: Mendelevium.svg

Show 9 more facts

element symbol: Unu
Commons category: Mendelevium
time of discovery or invention: 1955-01-01
atomic number: 101
Commons gallery: Mendelevium
canonical SMILES: [Md]
chemical formula: Md
Unicode character: 鍆
electronegativity: 1.3

Sources (6)

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~21 min read

Article

13 sections

Contents

Discovery
Characteristics
Physical
Chemical
Atomic
Isotopes
Production and isolation
Toxicity
Notes
References
Bibliography
Further reading
External links

Like all the transfermiums, it can only be produced in particle accelerators by bombarding lighter elements with charged particles. The element was first produced in 1955 by bombarding einsteinium with alpha particles, the method still used today. Using commonly-available microgram quantities of einsteinium-253, over a million mendelevium atoms may be made each hour. The chemistry of mendelevium is typical for the late actinides, with a dominant +3 oxidation state but also a +2 oxidation state accessible in solution. All known isotopes of mendelevium have short half-lives; there are currently no uses for it outside basic scientific research, and only small amounts are produced.