104 Rf 267
Rutherfordium
transition metal
Properties
- Atomic number
- 104
- Atomic mass
- 267 u
- Category
- transition metal
- Group
- 4
- Period
- 7
- Block
- d-block
- State (room temp)
- Solid
- Outer-shell electrons
- 2
- Electronegativity
- —
- Density
- 23.2 g/cm³
- Melting point
- 2126.85 °C
- Boiling point
- 5526.85 °C
Electron configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d¹⁰ 4p⁶ 5s² 4d¹⁰ 5p⁶ 6s² 4f¹⁴ 5d¹⁰ 6p⁶ 7s² 5f¹⁴ 6d²
Noble-gas shorthand: [Rn] 5f¹⁴ 6d² 7s²
Electrons per shell: 2, 8, 18, 32, 32, 10, 2 — that's 2 in the outermost shell.
About Rutherfordium
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.
- Discovered by Joint Institute for Nuclear Research
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.