Symbol	Rf
Atomic number	104
Group	4 (Titanium group)
Period	7
Block	d
Classification	Transition Metal

Appearance	-
Color	-

Number of protons	104 p+
Number of neutrons	157 n0
Number of electrons	104 e-

From Wikipedia, the free encyclopediaRutherfordium is a chemical element with symbol Rf and atomic number 104, named in honor of physicist Ernest Rutherford. It is a synthetic element (an element that can be created in a laboratory but is not found in nature) and radioactive; the most stable known isotope, 267Rf, has a half-life of approximately 1.3 hours. In the periodic table of the elements, it is a d - block element and the second of the fourth - row transition elements.

Phase at STP	Solid
Density	23.2 g/cm3
Atomic weight	261 u

Melting point	2400 K 2126.85 °C 3860.33 °F
Boiling point	5800 K 5526.85 °C 9980.33 °F
Heat of vaporization	-

Electronegativity (Pauling Scale)	-
Electron affinity	-
Oxidation states	(+2), (+3), +4 ()
Ionization energies	579.9 kJ/mol 1389.4 kJ/mol 2296.4 kJ/mol 3077.9 kJ/mol

Electron configuration Shorthand configuration	[Rn] 5f14 6d2 7s2
Electron configuration Full configuration	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
Electron configuration chart	1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
Electrons per shell	2, 8, 18, 32, 32, 10, 2
Valence electrons	2
Valency electrons	4
Bohr model	Figure: Shell diagram of Rutherfordium (Rf) atom.
Orbital Diagram 1s 2s 2p 3s 3p 3d 4s 4p 4d 4f 5s 5p 5d 5f 6s 6p 6d 7s

Discovery

Joint Institute for Nuclear Research, Lawrence Berkeley National Laboratory (1969)

CAS Number	53850-36-5
ChemSpider ID	11201447
EC number	-
PubChem CID Number	56951715