Rutherfordium
Element 104 on the periodic table, symbol Rf, group 4, period 7.
Rutherfordium 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.
Properties
- Atomic Number
- 104
- Atomic Mass
- 267.0000 u
- Group
- 4
- Period
- 7
- Block
- d-block
- Category
- Transition Metal
- State at 25 °C
- Solid
- Melting Point
- 2,400 K · 2,126.9 °C
- Boiling Point
- 5,800 K · 5,526.9 °C
- Density
- 23.2 g/cm³
- Atomic Radius
- Not measured
- Electronegativity
- Not measured
- Oxidation States
- +4
- Abundance in Crust
- Vanishingly rare
- Discovered
- 1964
- Discovered By
- Joint Institute for Nuclear Research
Electron Configuration
[Rn] 5f14 6d2 7s2
1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d2
Ionisation Energies (kJ/mol)
- 1. 580
Elements near Rutherfordium
Elements in the same group share the number of outer electrons and behave in similar ways. Elements in the same period share a shell, so they change steadily from left to right.