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Rutherfordium (Rf)

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.

Rutherfordium in the periodic table

SymbolRf
Atomic number104
Group4
Period7
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density23.2 g/cm3
Atomic weight267 u
Melting point2400 K
2126.85 °C
3860.33 °F
Boiling point5800 K
5526.85 °C
9980.33 °F

Atomic properties

Electronegativity (Pauling Scale)
Electron affinity kJ/mol
Oxidation states(+2), (+3), +4
()
Ionization energies
1579.9 kJ/mol
21389.4 kJ/mol
32296.4 kJ/mol
43077.9 kJ/mol

Electron configuration

Elektronkonfiguration (shorthand)[Rn] 5f14 6d2 7s2
Electron configuration1s2 2s2 2p6 3s2 3p6 3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f14 6s2 6p6 6d2 7s2
Electrons per shell2, 8, 18, 32, 32, 10, 2

History

Discovered1969
Discovered byJoint Institute for Nuclear Research
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