104Transition metal · Group 4 · Period 7
Rutherfordium
Rutherfordium (Rf) is element 104, a transition metal in the d-block — group 4, period 7. It is a solid at room temperature with 7 electron shells (2, 8, 18, 32, 32, 10, 2) and an atomic mass of 267 u.
- Atomic mass
- 267.0 u
- Phase · STP
- solid
- Melting
- 2400 K · 2127 °C
- Boiling
- 5800 K · 5527 °C
- Electronegativity
- —
- Density
- 23.2 g/cm³
Photograph — Image © CERN, Chemical Elements A Virtual Museum under a Creative Commons Attribution 3.0 Unported License, source: https://images-of-elements.com/rutherfordium.php
Identity
- Atomic number
- 104
- Standard atomic weight
- 267.0 u
- Category
- Transition metal
- Group
- 4
- Period
- 7
- Block
- d-block
- Oxidation states
- +4
Physical properties
- Melting point
- 2400 K · 2127 °C
- Boiling point
- 5800 K · 5527 °C
- Density
- 23.2 g/cm³
- Molar heat capacity
- —
- Atomic radius
- —
- Electron affinity
- —
Atomic structure
104protons
163neutrons
104electrons
2valence e⁻
- Noble-gas notation
- [Rn] 5f14 6d2 7s2
- Full configuration
- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d10 5p6 6s2 4f14 5d10 6p6 7s2 5f14 6d2
- Electrons per shell
- 2, 8, 18, 32, 32, 10, 2
Periodic trends
Where Rutherfordium ranks across all 118 elements.
Discovery
- Discovered
- 1964
- Discovered by
- Joint Institute for Nuclear Research
- Named by
- —
- Appearance
- —