Recognised as Chemical element
Rutherfordium
- Rf
- Z = 104
- transition metal
- No stable isotope
Rutherfordium (Rf) is element 104, a transition metal in period 7 and group 4. Its most stable isotope has mass number 267. Weights follow IUPAC standard atomic weights, 2021 revision.
Identity
SymbolRf
Mass number of the most stable isotope267this element has no stable isotope
Mass in kilograms4.4336393 × 10^-25
Categorytransition metal
Group4
Period7
Blockd-block
Electrons in a neutral atom104
Neutrons in the most common isotope163≈
Electron configuration
Configuration1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 4f¹⁴ 5s² 5p⁶ 5d¹⁰ 5f¹⁴ 6s² 6p⁶ 6d² 7s²predicted by the Madelung rule; no ground state has been measured
Noble gas shorthand[Rn] 5f¹⁴ 6d² 7s²
Electrons per shell2, 8, 18, 32, 32, 10, 2K, L, M and outward
Electrons in the outer shell2
Unpaired electrons2Hund's rule; unpaired electrons make the free atom paramagnetic
Madelung ruleAssumeda prediction, not a measurement
Quantities
Molar mass267 g/mol
Mass of one mole267 grams
Atoms in one gram2.2554834 × 10^21
Mass of one atom4.4336393 × 10^-22 g
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