104 predicted 2 · 8 · 18 · 32 · 32 · 10 · 2

Rutherfordium, Rf, element 104

Transition metal· Period 7· Group 4· d-block

Configuration [Rn]5f146d27s2

Atomic weight
267Da
Phase
solid, predicted
Density
17g/cm³, predicted
Melting point
2,400K, predicted 2,127 °C
Boiling point
5,800K, predicted 5,527 °C
Electronegativity
No data

Radioactive transactinide element. Expected to have similar chemical properties to those displayed by hafnium. Rf-260 was discovered by the Joint Nuclear Research Institute at Dubna (U.S.S.R.) in 1964. Researchers at Berkeley discovered Unq-257 and Unq-258 in 1964. Description from mendeleev.

Back to the table
The outermost shell: the valence electronsThe inner shellsThe nucleus One bead for each electron, on the ring of its shell, counted from the nucleus out. The rings turn at their own pace; the model is Bohr's picture of the atom, which places electrons in shells but not on true orbits.

Atomic properties

4 of 5 fields have a value for rutherfordium

Atomic weight The standard atomic weight. For an element with no stable isotope, the mass of its longest-lived isotope.
267Da
Source: mendeleev
Electron configuration
[Rn]5f146d27s2
Source: mendeleev
Electron configuration in full The electron configuration with the noble-gas core written out.
1s22s22p63s23p63d104s24p64d104f145s25p65d105f146s26p66d27s2
Source: Worked outfrom electron configuration
Electrons in each shell Counted from the electron configuration, from the first shell outward.
2 · 8 · 18 · 32 · 32 · 10 · 2
Source: Worked outfrom electron configuration

No data uncertainty of the atomic weight.