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26Fe55.845
Iron
Transition MetalIron is a chemical element with symbol Fe (from Latin:ferrum) and atomic number 26. It is a metal in the first transition series. It is by mass the most common element on Earth, forming much of Earth's outer and inner core.
Phase: SolidAppearance: lustrous metallic with a grayish tinge
2, 8, 14, 2
Physical Properties
Atomic Mass55.8452 u
Density7.874 g/cm³
Melting Point1811 K
Boiling Point3134 K
Molar Heat25.1 J/(mol·K)
Period4
PhaseSolid
Chemical Properties
Electron Configuration1s2 2s2 2p6 3s2 3p6 4s2 3d6
Semantic Config[Ar] 3d6 4s2
Shells2, 8, 14, 2
Electron Affinity14.785 kJ/mol
Electronegativity1.83
Ionization Energies
IE1: 762.5 kJ/molIE2: 1561.9 kJ/molIE3: 2957 kJ/molIE4: 5290 kJ/molIE5: 7240 kJ/molIE6: 9560 kJ/molIE7: 12060 kJ/molIE8: 14580 kJ/molIE9: 22540 kJ/molIE10: 25290 kJ/molIE11: 28000 kJ/molIE12: 31920 kJ/molIE13: 34830 kJ/molIE14: 37840 kJ/molIE15: 44100 kJ/molIE16: 47206 kJ/molIE17: 122200 kJ/molIE18: 131000 kJ/molIE19: 140500 kJ/molIE20: 152600 kJ/molIE21: 163000 kJ/molIE22: 173600 kJ/molIE23: 188100 kJ/molIE24: 195200 kJ/molIE25: 851800 kJ/molIE26: 895161 kJ/mol
Discovery
Discovered by5000 BC