Symbol	Md
Atomic number	101
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	-
Color	-

Number of protons	101 p+
Number of neutrons	157 n0
Number of electrons	101 e-

From Wikipedia, the free encyclopediaMendelevium is a synthetic element with chemical symbol Md (formerly Mv) and atomic number 101. A metallic radioactive transuranic element in the actinide series, it is the first element that currently cannot be produced in macroscopic quantities through neutron bombardment of lighter elements. It is the antepenultimate actinide and the ninth transuranic element.

Phase at STP	Solid
Density	g/cm3
Atomic weight	258 u

Melting point	1100 K 826.85 °C 1520.33 °F
Boiling point	-
Heat of vaporization	-

Electronegativity (Pauling Scale)	1.3
Electron affinity	93.91 kJ/mol
Oxidation states	+2, +3 ()
Ionization energies	635 kJ/mol 1235 kJ/mol 2470 kJ/mol 3840 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f13 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f13 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f13 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 31, 8, 2
Valence electrons	2
Valency electrons	3
Bohr model	Figure: Shell diagram of Mendelevium (Md) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Lawrence Berkeley National Laboratory (1955)

CAS Number	7440-11-1
ChemSpider ID	22385
EC number	-
PubChem CID Number	23943