What is Mendelevium
Mendelevium (pronounced as men-deh-LEE-vee-em) is a radioactive metal that belongs to the family of actinides and represented by the chemical symbol Md. Its most stable isotope is Md-258 with a half-life of 51.5 days [1, 4].
Origin of its Name: The element is named in honor of Dmitri Mendeleev, a Russian chemist who formulated one of the first periodic tables .
Who Discovered it: Albert Ghiorso and his team of researchers comprising of Gregory Chopin, Bernard Harvey, Glenn Seaborg, and Stanley Thompson were responsible for its discovery .
When and Where was Mendelevium Discovered
In 1955, Ghiorso and his team at Berkeley, California, conducted an all-night experiment where a sample of einsteinium-253 was bombarded with alpha particles in a cyclotron to produce a new isotope, later detected as mendelevium-256 with a half-life of about 78 minutes. After this, several other isotopes of the new metal were synthesized at the laboratory .
|Atomic number||101 |
|CAS number||7440-11-1 |
|Position in the periodic table ||Group||Period||Block|
Properties and Characteristics of Mendelevium
|Relative atomic mass||258 |
|Atomic mass||258 atomic mass units |
|Melting point/freezing point||827°C (1521°F) |
|Boiling point||Unknown |
|State at standard room temperature (solid/liquid/gas)||Solid |
|Electrical conductivity||Unknown |
|Oxidation state/Oxidation number||+2, +3 |
Atomic Data of Mendelevium (Element 101)
|Valence electrons||3 |
|Electron configuration (noble gas configuration)||[Rn] 5f137s2 |
|Atomic structure |
|– Number of Electrons||101|
|– Number of Neutrons||157|
|– Number of Protons||101|
|Radius of atom|
|– Atomic Radius||2.46 Å |
|– Covalent Radius||1.73 Å |
|Ionization energy 
What is Mendelevium Used for
The short half-life of Md makes it difficult to study its properties in detail, and determine any uses. As a result, it is artificially synthesized whenever required for scientific studies .
- As naming the element after a Russian chemist was a bold decision taken in the middle of the Cold War, Glenn Seaborg had to take permission from the U.S government before officially declaring the discovery of mendelevium .
- The proposed symbol for the element was Mv, but IUPAC changed it to Md in 1957, at their assembly in Paris .
Since the element is artificially prepared in the laboratory, it cannot be commercially availed.