Mendelevium: the essentials

Mendelevium is a radioactive rare earth metal named after Dmitri Mendeleev, father of the Periodic Table.

Mendelevium: historical information

Mendelevium was discovered by Glenn T. Seaborg, Albert Ghiorso, Bernard Harvey, Gregory Choppin, Stanley G. Thompson in 1955 at USA. Origin of name: named after Dimitri "Mendeleev", the Russian chemist who contributed so much to the development of the periodic table.

Mendelevium, the ninth transuranium element of the actinide series to be discovered, was first identified by Seaborg and others in 1955 as a product of the bombardment of the einsteinium isotope 253Es with helium ions. The isotope produced was 256Md, which has a half-life of about 11/4 hours.

Mendelevium around us Read more »

Mendelevium has no biological role.

Mendelevium is a synthetic element that is not present in the geosphere.

Abundances for cobalt in a number of different environments. More abundance data »
Location ppb by weight ppb by atoms Links
Universe (no data) (no data) Chemical elements abundance by weight in the universe on a miniature periodic table spark table
Crustal rocks (no data) (no data) Chemical elements abundance by weight in the earth's crust on a miniature periodic table spark table
Human (no data) ppb by weight (no data) atoms relative to C = 1000000 Chemical elements abundance by weight in humans on a miniature periodic table spark table

Physical properties Read more »

Heat properties Read more »

Crystal structure Read more »

The solid state structure of mendelevium is: .

Mendelevium: orbital properties Read more »

Mendelevium atoms have 101 electrons and the shell structure is The ground state electronic configuration of neutral Mendelevium is [Rn].5f13.7s2 and the term symbol of Mendelevium is 2F7/2.


Isolation: coming soon!

Mendelevium isotopes Read more »

Table. Stables isotopes of cobalt.
Isotope Mass
(atom %)
spin (I)
moment (μ/μN)

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