Iron (Fe)

From Wikipedia, the free encyclopediaIron 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.

Iron in the periodic table

SymbolFe
Atomic number26
Group8
Period4
Blockd
Element categoryTransition Metal

Physical properties

Phase at STPSolid
Density7.874 g/cm3
Atomic weight55.8452 u
Melting point1811 K
1537.85 °C
2800.13 °F
Boiling point3134 K
2860.85 °C
5181.53 °F

Atomära egenskaper

Electronegativity (Pauling Scale)1.83
Electron affinity14.785 kJ/mol
Ionization energies
1762.5 kJ/mol
2 1561.9 kJ/mol
3 2957 kJ/mol
4 5290 kJ/mol
5 7240 kJ/mol
6 9560 kJ/mol
7 12060 kJ/mol
8 14580 kJ/mol
9 22540 kJ/mol
10 25290 kJ/mol
11 28000 kJ/mol
12 31920 kJ/mol
13 34830 kJ/mol
14 37840 kJ/mol
15 44100 kJ/mol
16 47206 kJ/mol
17 122200 kJ/mol
18 131000 kJ/mol
19 140500 kJ/mol
20 152600 kJ/mol
21 163000 kJ/mol
22 173600 kJ/mol
23 188100 kJ/mol
24 195200 kJ/mol
25 851800 kJ/mol
26 895161 kJ/mol

Electron configuration

Electron configuration1s2 2s2 2p6 3s2 3p6 3d6 4s2
Electrons per shell2, 8, 14, 2

History

Discovered-5000
Discovered byMiddle East