Group 8 Element
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Group 8 Element
Group 8
IUPAC group number 8
Name by element
CAS group number
(US, pattern A-B-A)
part of VIIIB
old IUPAC number
(Europe, pattern A-B)
part of VIII

Image: Iron, electrolytic made, 99,97%+
Iron (Fe)
26 Transition metal
Image: Ruthenium bar, 99,99%
Ruthenium (Ru)
44 Transition metal
Image: Osmium crystals, ?99,99%
Osmium (Os)
76 Transition metal
7 Hassium (Hs)
108 Transition metal


primordial element
synthetic element
Atomic number color:

Group 8 is a group (column) of chemical elements in the periodic table. It consists of iron (Fe), ruthenium (Ru), osmium (Os) and hassium (Hs).[1] They are all transition metals.

Like other groups, the members of this family show patterns in electron configuration, especially in the outermost shells, resulting in trends in chemical behavior.

"Group 8" is the modern standard designation for this group, adopted by the IUPAC in 1990.[1]

In the older group naming systems, this group was combined with the groups 9 (Co, Rh, Ir...) and 10 (Ni, Pd, Pt...) and called group "VIIIB" in the Chemical Abstracts Service (CAS) "U.S. system", or "VIII" in the old IUPAC (pre-1990) "European system" (and in Mendeleev's original table).

Group 8 (current IUPAC) should not be confused with "group VIIIA" in the CAS system, which is group 18 (current IUPAC), the noble gases.

While groups (columns) of the periodic table are sometimes named after their lighter member (as in "the oxygen group" for group 16), the term iron group does not mean "group 8". Most often, it means a set of adjacent elements on period (row) 4 of the table that includes iron, such as chromium, manganese, iron, cobalt, and nickel; or only the last three; or some other set, depending on the context.

Basic properties

Z Element No. of electrons
per shell
M.P. B.P. Year of
26 iron 2, 8, 14, 2 1811 K
1538 °C
3134 K
2862 °C
<3000 BCE Unknown
44 ruthenium 2, 8, 18, 15, 1 2607 K
2334 °C
4423 K
4150 °C
1844 K. E. Claus
76 osmium 2, 8, 18, 32, 14, 2 3306 K
3033 °C
5285 K
5012 °C
1803 S. Tennant and
W. H. Wollaston
108 hassium 2, 8, 18, 32, 32, 14, 2 -- -- 1984 P. Armbruster and
G. Münzenberg

The first three elements are hard silvery-white metals. Hassium has not been isolated in macroscopic pure form, and its properties have not been conclusively observed.


  1. ^ a b Leigh, G. J. Nomenclature of Inorganic Chemistry: Recommendations 1990. Blackwell Science, 1990. ISBN 0-632-02494-1.

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