Interactive periodic table
Colour the elements by category, block, or any property, and click one to see where it sits in the periodic trends.
57–71 89–103
- Alkali metal
- Alkaline-earth metal
- Transition metal
- Post-transition metal
- Metalloid
- Nonmetal
- Halogen
- Noble gas
- Lanthanide
- Actinide
26 Fe 55.845
Iron
Transition metal
[Ar] 3d⁶ 4s²
- Electronegativity (Pauling)
- 1.83
- First ionization energy
- 762 kJ/mol
- Electron affinity
- 15.7 kJ/mol
- Covalent radius
- 132 pm
Open element page Periodic trend
Dashed lines mark the noble gases that close each period. Click the chart to pick an element.
Data: PubChem periodic table (public domain); atomic weights are IUPAC abridged standard values; covalent radii from Cordero et al. (2008).