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Group 8 element
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<table><tbody><tr><th colspan="2">↓ <a href="/facts/Period_(periodic_table)/WpGUFh5V">Period</a></th></tr><tr><th><a href="/facts/Period_4_element/BgDFfE26">4</a></th><td><a href="/facts/Iron/QK1JYy8E">Iron</a> (Fe)26 <a href="/facts/Transition_metal/0slGWoLQ">Transition metal</a></td></tr><tr><th><a href="/facts/Period_5_element/xLJUWWDS">5</a></th><td><a href="/facts/Ruthenium/uzCm4ufn">Ruthenium</a> (Ru)44 <a href="/facts/Transition_metal/0slGWoLQ">Transition metal</a></td></tr><tr><th><a href="/facts/Period_6_element/9YleCXwf">6</a></th><td><a href="/facts/Osmium/1TjXD69n">Osmium</a> (Os)76 <a href="/facts/Transition_metal/0slGWoLQ">Transition metal</a></td></tr><tr><th><a href="/facts/Period_7_element/H5QuVHGQ">7</a></th><td><a href="/facts/Hassium/t0bgGzwt">Hassium</a> (Hs)108 <a href="/facts/Transition_metal/0slGWoLQ">Transition metal</a></td></tr><tr><td colspan="2"><p><i>Legend</i></p><table><tbody><tr><td><a href="/facts/Primordial_element/lFAUqHDv">primordial element</a></td></tr><tr><td><a href="/facts/Synthetic_element/azU9Nr1m">synthetic element</a></td></tr></tbody></table></td></tr></tbody></table> <p>Group 8 is a <a href="/facts/Group_(periodic_table)/YGBcUabv">group</a> (column) of <a href="/facts/Chemical_element/0jducgWD">chemical elements</a> in the <a href="/facts/Periodic_table/umdGIfUb">periodic table</a>. It consists of <a href="/facts/Iron/QK1JYy8E">iron</a> (Fe), <a href="/facts/Ruthenium/uzCm4ufn">ruthenium</a> (Ru), <a href="/facts/Osmium/1TjXD69n">osmium</a> (Os) and <a href="/facts/Hassium/t0bgGzwt">hassium</a> (Hs). "Group 8" is the modern standard designation for this group, adopted by the <a href="/facts/IUPAC/2AV6myCK">IUPAC</a> in 1990. It should not be confused with "group VIIIA" in the CAS system, which is group 18 (current IUPAC), the <a href="/facts/Noble_gas/j0yHMEAE">noble gases</a>. In the <a href="/facts/Group_(periodic_table)/YGBcUabv">older group naming systems</a>, this group was combined with groups <a href="/facts/Group_9_element/YsFjV4Ey">9</a> and <a href="/facts/Group_10_element/oIUwy5mC">10</a> and called group "VIIIB" in the <a href="/facts/Chemical_Abstracts_Service/CVLrS5IJ">Chemical Abstracts Service</a> (CAS) "U.S. system", or "VIII" in the old IUPAC (pre-1990) "European system" (and in <a href="/facts/Mendeleev/xdouRrx8">Mendeleev</a>'s original table). The elements in this group are all <a href="/facts/Transition_metal/0slGWoLQ">transition metals</a> that lie in the <a href="/facts/D-block/BbzD5jUU">d-block</a> of the periodic table. </p><p>While groups (columns) of the periodic table are usually named after their lightest member (as in "the oxygen group" for group 16), <a href="/facts/Iron_group/QXkrNgvK">iron group</a> has historically been used differently; most often, it means a set of adjacent elements on <a href="/facts/Period_4_element/BgDFfE26">period (row) 4</a> of the table that includes iron, such as <a href="/facts/Chromium/6sVk6Uu7">chromium</a>, <a href="/facts/Manganese/j9ELd1TL">manganese</a>, <a href="/facts/Iron/QK1JYy8E">iron</a>, <a href="/facts/Cobalt/gqhScEw4">cobalt</a>, and <a href="/facts/Nickel/KwMCHYRP">nickel</a>, or only the last three, or some other set, depending on the context. </p><p>Like other groups, the members of this family show patterns in <a href="/facts/Electron_configuration/TQjRr22P">electron configuration</a>, especially in the outermost shells, resulting in trends in chemical behavior. </p>