Symbol	No
Atomic number	102
Group	-
Period	7
Block	f
Classification	Actinide

Appearance	-
Color	-

Number of protons	102 p+
Number of neutrons	157 n0
Number of electrons	102 e-

From Wikipedia, the free encyclopediaNobelium is a synthetic chemical element with symbol No and atomic number 102. It is named in honor of Alfred Nobel, the inventor of dynamite and benefactor of science. A radioactive metal, it is the tenth transuranic element and is the penultimate member of the actinide series.

Phase at STP	Solid
Density	g/cm3
Atomic weight	259 u

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

Electronegativity (Pauling Scale)	1.3
Electron affinity	-223.22 kJ/mol
Oxidation states	+2, +3 ()
Ionization energies	642 kJ/mol 1254 kJ/mol 2643 kJ/mol 3956 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f14 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 7s2
Electrons per shell	2, 8, 18, 32, 32, 8, 2
Valence electrons	2
Valency electrons	3
Bohr model	Figure: Shell diagram of Nobelium (No) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 7s

Discovery

Joint Institute for Nuclear Research (1966)

CAS Number	10028-14-5
ChemSpider ID	23207
EC number	-
PubChem CID Number	24822