Editing Group 6 element (section)

{{short description|Group of chemical elements}}
{{Infobox periodic table group
| title       = Group&nbsp;6 {{nowrap|in the periodic table}}
| group number= 6
| trivial name=
| by element  = chromium group
| CAS         = VIB
| old IUPAC   = VIA
| mark        = Cr,Mo,W,Sg
| left        = [[Group 5 element|group 5]]
| right       = [[Group 7 element|group 7]]
}}
{| class="floatright"
! colspan=2 style="text-align:left;" | ↓&nbsp;<small>[[Period (periodic table)|Period]]</small>
|-
! [[Period 4 element|4]]
| {{element cell image|24|Chromium|Cr| |Solid|Transition metal|Primordial|image=Chromium crystals and 1cm3 cube.jpg|image caption=Chromium crystal bar}}
|-
! [[Period 5 element|5]]
| {{element cell image|42|Molybdenum |Mo| |Solid|Transition metal|Primordial|image=Molybdenum crystaline fragment and 1cm3 cube.jpg|image caption=Molybdenum crystal bar}}
|-
! [[Period 6 element|6]]
| {{element cell image|74|Tungsten |W| |Solid|Transition metal|Primordial|image=Wolfram evaporated crystals and 1cm3 cube.jpg|image caption=Tungsten crystal bar}}
|-
! [[Period 7 element|7]]
| {{element cell image|106|Seaborgium|Sg| |Unknown phase|Transition metal|Synthetic}}
|-
| colspan="2"|
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''Legend''
{| style="text-align:center; border:0; margin: 0 auto"
|-
| style="border:{{element color|Primordial}}; background:{{Element color|table mark}}; padding:0 2px;" | [[primordial element]]
|-
| style="border:{{element color|Synthetic}}; background:{{Element color|table mark}}; padding:0 2px;" | [[synthetic element]]
|}
|}

'''Group 6''', numbered by [[IUPAC]] style, is a group of [[Chemical element|elements]] in the [[periodic table]]. Its members are [[chromium]] (Cr), [[molybdenum]] (Mo), [[tungsten]] (W), and [[seaborgium]] (Sg). These are all [[transition metal]]s and chromium, molybdenum and tungsten are [[refractory metals]].

The [[electron configuration]] of these elements do not follow a unified trend, though the outermost shells do correlate with trends in chemical behavior:

{| class="wikitable" style="white-space:nowrap;"
|-
!''[[Atomic number|Z]]'' !! [[Chemical element|Element]] !! Electrons per [[Electron shell|shell]]
|-
| 24 || chromium || 2, 8, 13, 1
|-
| 42 || molybdenum || 2, 8, 18, 13, 1
|-
| 74 || tungsten || 2, 8, 18, 32, 12, 2
|-
| 106 || seaborgium || 2, 8, 18, 32, 32, 12, 2
|}

"Group 6" is the new IUPAC name for this group; the old style name was "''group VIB''" in the old US system (CAS) or "''group VIA''" in the European system (old IUPAC). Group 6 must not be confused with the group with the old-style group crossed names of either ''VIA'' (US system, CAS) or ''VIB'' (European system, old IUPAC). ''That'' group is now called [[Group 16 element|group 16]].
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