Manganese Cobalt

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

Symbol

Atomic number

Group

Period

Block

Element category

Transition Metal

Physical properties

Phase at STP

Solid

Density

7.874 g/cm³

Atomic weight

55.8452 u

Melting point

1811 K
1537.85 °C
2800.13 °F

Boiling point

3134 K
2860.85 °C
5181.53 °F

Atomic properties

Electronegativity (Pauling Scale)

1.83

Electron affinity

14.785 kJ/mol

Oxidation states

−4, −2, −1, 0, +1, +2, +3, +4, +5, +6, +7
(an amphoteric oxide)

Ionization energies

1	762.5 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

Elektronkonfiguration (shorthand)

[Ar] 3d⁶ 4s²

Electron configuration

1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁶ 4s²

Electrons per shell

2, 8, 14, 2

History

Discovered

-5000

Discovered by

Middle East