26
Fe
Iron
Iron
Iron (Fe)
Transition Metals · Solid · Period 4 · Group 8
Element Properties
- Atomic Number
- 26
- Symbol
- Fe
- Atomic Mass
- 55.84
- Category
- Transition Metals
- Standard State
- Solid
- Period
- 4
- Group
- 8
- Electronegativity
- 1.83
- Atomic Radius
- 194
- Ionization Energy
- 7.9
- Electron Affinity
- 0.16
- Oxidation States
- +3, +2
- Melting Point
- 1811 K (1537.85 °C)
- Boiling Point
- 3134 K (2860.85 °C)
- Density
- 7.874
- Electron Configuration
- [Ar]4s2 3d6
- Year Discovered
- Ancient
Electron shells
[Ar]4s2 3d6
Electrons are arranged in shells (principal energy levels) around the nucleus. The diagram is a schematic — orbitals in the same shell are not drawn separately.
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Frequently asked questions
What is the atomic number of Iron?
The atomic number of Iron is 26, which equals the number of protons in its nucleus.
What is the atomic mass of Iron?
The atomic mass of Iron is approximately 55.84 u (one twelfth of the mass of a carbon-12 atom).
What is the electron configuration of Iron?
The electron configuration of Iron is [Ar]4s2 3d6.
Where is Iron in the periodic table?
Iron is located in period 4, group 8.
When was Iron discovered?
Iron has been known since antiquity.