Iron

Iron (/ˈaɪərn/ eye-ər-n) is a chemical element with the symbol Fe (from Latin: ferrum) and atomic number 26. It is a metal in the first transition series. It is the most common element (by mass) forming the planet Earth as a whole, forming much of Earth's outer and inner core. It is the fourth most common element in the Earth's crust. Iron's very common presence in rocky planets like Earth is due to its abundant production as a result of fusion i... More
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Also known as:

  • Iron, Fe

Chemical Element

The 26th Element in the Periodic Table

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Manganese

Manganese ( /ˈmæŋɡəniːz/ mang-gə-neez) is a chemical element, designated by the symbol Mn. It has the atomic number 25. It is found as a free element...

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Cobalt

Cobalt ( /ˈkoʊbɒlt/ koh-bolt or /ˈkoʊbɔːlt/ koh-bawlt) is a chemical element with symbol Co and atomic number 27. It is found naturally only in...

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Symbol:

  • Fe

Atomic mass:

Mass Uncertainty
  • 55.845 u (9.2733E-17 µg )
  • 0.002 u (3.32E-21 µg )

Electrons per shell:

  • 2, 8, 14, 2

Electron affinity:

Value Uncertainty
  • 0.151 eV (1.51E-7 MeV )
  • 0.003 eV (3E-9 MeV )

Electronegativity (Pauling scale):

  • 1.83

Atomic radius:

  • 140 pm (0.00000551 )

Covalent radius:

  • 1.25 pm (4.92E-8 )

Van der Waals radius:

  • 205 pm (0.00000807 )

Isotopes:

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Melting Point:

  • 1,534.85 °C (2794.76 °F )

Boiling Point:

  • 2,749.85 °C (4981.78 °F )

Chemical series:

Periodic table block:

Ionization Energy:

  • 7.9024 eV (0.0000079024 MeV )

Discovery Date:

  • 5000 B.C.E.

Electron Configuration:

  • Ar 3d6 4s2
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