Ogled vira Predloga:Periodni sistem (skupina 18)

{{Infopolje skupina periodnega sistema/header
| title       = Skupina&nbsp;18 {{nowrap|v periodnem sistemu}}
| group number= 18
| trivial name= žlahtni plini
| by element  = helijeva skupina ''ali''<br/>neonova skupina
| CAS         = VIIIA
| old IUPAC   = 0
| mark        = He,Ne,Ar,Kr,Xe,Rn,Og
| left        = [[halogen]]i
| right       = [[alkalijska kovina|alkalijske kovine]]}}
|-
! colspan=2 style="text-align:left;" | ↓&nbsp;<small>[[Perioda periodnega sistema|Perioda]]</small>
|-
! [[Element 1. periode|1]]
| {{element cell image|2|Helij|He| |Gas|Noble gases|Primordial|legend=|image=Helium discharge tube.jpg|image caption=Helium discharge tube}}
|-
! [[Element 2. periode|2]]
| {{element cell image|10|Neon|Ne| |Gas|Noble gases|Primordial|legend=|image=Neon discharge tube.jpg|image caption=Neon discharge tube}}
|-
! [[Element 3. periode|3]]
| {{element cell image|18|Argon|Ar| |Gas|Noble gases|Primordial|legend=|image=Argon discharge tube.jpg|image caption=Argon discharge tube}}
|-
! [[Element 4. periode|4]]
| {{element cell image|36|Kripton|Kr| |Gas|Noble gases|Primordial|legend=|image=Krypton discharge tube.jpg|image caption=Krypton discharge tube}}
|-
! [[Element 5. periode|5]]
| {{element cell image|54|Ksenon|Xe| |Gas|Noble gases|Primordial|legend=|image=Xenon discharge tube.jpg|image caption=Xenon discharge tube}}
|-
! [[Element 6. periode|6]]
| {{element cell image|86|Radon|Rn| |Gas|Noble gases|From decay|legend=|image=}}<!-- non-free image removed-->

|-
! [[Element 7. periode|7]]
| {{element cell image|118|Oganeson|Og| |unknown phase|Noble gases|Synthetic|legend=|image=}}
|-
| colspan="2"|
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''Legenda''
{| style="text-align:center; border:0; margin: 0 auto;"
|-
| style="border:{{element color|Primordial}}; background:{{element color|table mark}}" | [[Prvobitni element|prvobitni]]
|-
| style="border:{{element color|from decay}}; padding:0 2px; background:{{element color|table mark}}" | [[radioaktivni razpad|naravni proizvod radioaktivnega razpada]]
|}
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