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General Info
Atomic Symbol Atomic symbol::Md
Atomic Number Atomic number::101
Atomic Weight Atomic weight::258 g/mol
Chemical series Actinides
Appearance Unknown
Group, Period, Block n/a, 7, f
Electron configuration [Rn] 5f13, 7s2
Electrons per shell 2, 8, 18, 32, 31, 8, 2
Electron shell mendelevium.png
CAS number CAS number::7440-11-1
Physical properties
Phase Solid
Density Density::Unknown g/ml
Melting point Melting point::1100K
Boiling point Boiling point::Unknown
Isotopes of Mendelevium
iso NA half-life DT DE (MeV) DP
is stable with neutrons.
All properties are for STP unless otherwise stated.

Mendelevium (pronounced men-deh-LEE-vi-em) is a radioactive chemical element with the symbol Md and the atomic number 101. It is a metal, classified as a transitional element and a transuranic actinide, which is located in the bottom row of the periodic table. This element was discovered by the University of Berkeley, and named after Dimitri Mendeleev, who developed the Periodic Table.[1]


Mendelevium is a solid, which is synthetic or man-made. This element is synthesized bombarding other elements like Einsteinium with charge particles.[2]256Md has been used used to find some of the chemical properties in aqueous solution. This element has moderately stable dispositive oxidation state and can be shown to have a monopositive state. [1]


Mendelevium was first discovered by Albert Ghiorso, Glenn T. Seaborg, Gregory R. Choppin, Bernard G. Harvey, and Stanley G. Thompson in 1955 at the University of California, is named in honor of Dimitri Mendeleev who developed the Periodic Table of elements. Berkeley researchers produced 256Md when they after bombarding Es with alpha particles in the Radiation Laboratory's 60-inch cyclotron(a type of particle accelerator).[3]

Mendelevium Compound

The sections of binary compound with some compounds of mendelevium have a formal oxidation number for Mendelevium. However, uses of this compound limited for p-block element. Looking at oxidation number, and electronic configuration are not given. Exotic compound only view this as guide. In compounds of Mendelevium, the common oxidation number is three.

Hydrides •none listed

Fluorides •none listed

As a result, Mendelevium does not have compounds.[4]


Mendelevium does not exist in nature and was been produced in small amounts which are expensive and are time consuming to synthesize. It used for scientific research. [2]

Dmitri Mendeleev

Picture of Dmitri Mendeleev

Dimitri Mendeleev was born in Tobolsa, Samaria in 1834 and died in 1967. He arranged the elements into the periodic table based on atomic weight. His first periodic table was arranged by increasing atomic weight and grouping them by similarity of properties. However, he wasn't able to knew about noble gas element, which he does not included in the periodic table.[5]He studied thermal expansion which is the concept of changing matter and changing temperatures. At the end of his age, he retire from being college professor.[2]


Mendelevium has eighteen radioisotopes. Md258 is the most stable isotopes and this isotopes bombardment of isotopes of element Einstein.

Isotope Atomic Mass Half-life
Md245 245.08 0.90 ms
Md246 246.081 1 seconds
Md247 247.08 1.12 seconds
Md248 248.082 7 seconds
Md249 249.03 24 seconds
Md250 250.084 52 seconds
Md251 251.084 4 minutes
Md252 252.086 2.3 minutes
Md253 253.087 12 minutes
Md254 254.089 10 minutes
Md255 255.091 27 minutes
Md256 256.094 77 minutes
Md257 257.095 5.52 hours
Md258 258.098 51.5 days
Md258m 57 minutes
Md259 259.1 1.6 hours
Md260 260.1 31.8 days
Md261 261.1 ~40 minutes
Md262 262.1 ~3 minutes




  1. 1.0 1.1 Mendelevium. Wikipedia. Web. Accessed November 3, 2011.
  2. 2.0 2.1 2.2 Author-Unknown. What is Mendelevium. Wisegreek. Web. © 2003 - 2011.
  3. Author-Marion Coon Marion. Mendelivium. The Encyclopedia Of Earth. Web. November 24, 2009, 9:05 pm.
  4. Author-Markwinter. Mendelevium Compounds. Web Elements. Web. © 1993-2011.
  5. Author-Unknown. Dimitri Mendeleev. KIwi-web. Web. � HA Campbell 1998-2011.
  6. Author-Unknown. Isotopes. Unknown. Web. access 17 November 2011.