26 - Iron transition metal
Discovered by 5000 BC in ~5000 BC
Iron 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.
H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr Rb Sr Y Zr Nb Mo Tc Ru Rh Pd Ag Cd In Sn Sb Te I Xe Cs Ba La Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Hf Ta W Re Os Ir Pt Au Hg Tl Pb Bi Po At Rn Fr Ra Ac Th Pa U Np Pu Am Cm Bk Cf Es Fm Md No Lr Rf Db Sg Bh Hs Mt Ds Rg Cn Nh Fl Mc Lv Ts Og
57-71 La-Lu Lanthanides
89-103 Ac-Lr Actinides
| Shell | Electrons | Orbitals |
|---|---|---|
| 1 | 2 | 2 in 1s |
| 2 | 8 | 2 in 2s + 6 in 2p |
| 3 | 14 | 2 in 3s + 6 in 3p + 6 in 3d |
| 4 | 2 | 2 in 4s |
55.8 u Atomic Mass
1.7 Å Atomic Radius
3.13k K Boiling Point
1.32 Å Covalent Radius
7.87 g/cm³ Density
14.8 Electron Affinity
1.83 Electronegativity
7.9 eV First Ionization Energy
1.81k K Melting Point
4 Number of Shells
26 Atomic Number
2, 8, 14, 2 Electron Shell Occupations