Nwy nobl: Gwahaniaeth rhwng fersiynau
Cynnwys wedi'i ddileu Cynnwys wedi'i ychwanegu
Tabl elfennau |
parhau |
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Llinell 1:
{| style="float: right; border: 1px solid #ccc; margin: 0.5em 0pt 0.8em 1.4em; padding: 3px !important; width: 75px;"
! [[Grŵp yn y tabl cyfnodol|Grŵp]] →!! 18
Llinell 30 ⟶ 29:
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<center>'''Allwedd'''</center>
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| colspan="2" style="text-align: center; border: 1px solid #AAAAAA; background:{{Element color/Noble gases}};"|
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| colspan="2" style="text-align: center; border: 1px solid #AAAAAA; color: {{element color/Gas}};" |
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| colspan="2" style="text-align: center; border: {{element frame/Primordial}};" |
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| colspan="2" style="text-align: center; border: {{element frame/Natural radio}};"|
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| colspan="2" style="text-align: center; border: {{element frame/Synthetic}};" |
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[[Delwedd:Arwydd_Neon.jpg|thumb|200px|right|Defnyddir Neon mewn arwyddion lliwgar]]▼
Y '''nwyon nobl''' yw'r [[elfen gemegol|elfennau cemegol]] sy'n aelodau o grŵp 18 o'r [[tabl cyfnodol]]. Mae'r gyfres gemegol hon yn cynnwys [[heliwm]], [[neon]], [[argon]], [[crypton]], [[senon]] a [[radon]].
▲[[Delwedd:Arwydd_Neon.jpg|thumb|200px|right|Defnyddir Neon mewn arwyddion lliwgar]]
== Enwi ==
Llinell 129 ⟶ 128:
=== Priodweddau Cemegol ===
Mae pob aelod o'r grŵp yn dangos adweithedd isel iawn, gyda heliwn a neon yn hollol anadweithiol. Gall senon a crypton cyflawni nifer fach o adweithiau cemegol yn y labordy, ac yn diweddar mae rhai cyfansoddion argon wedi eu paratoi. Mae eu hadweithedd isel wedi ei gysylltu a'u hadeiledd electronig, gyda phlisgyn falens llawn ym mhob un o'r elfennau hyn. Oherwydd hyn, nid oes ganddynt tuedd i ennill na cholli electronau h.y. mae eu hegnïon ïoneiddiad yn uchel a'u helectronegatifeddau'n isel.
==Lliw a roddir==
<center>
{| class="wikitable" style="text-align:center;"
|+ Colors and spectra (bottom row) of electric discharge in pure noble gases
| width="20%"|[[Delwedd:Helium-glow.jpg|alt=Glass tube shining violet light with a wire wound over it|160px]]
| width="20%"|[[Delwedd:Neon-glow.jpg|alt=Glass tube shining orange light with a wire wound over it|160px]]
| width="20%"|[[Delwedd:Argon-glow.jpg|alt=Glass tube shining violet-blue light with a wire wound over it|160px]]
| width="20%"|[[Delwedd:Krypton-glow.jpg|alt=Glass tube shining white light with a wire wound over it|160px]]
| width="20%"|[[Delwedd:Xenon-glow.jpg|alt=Glass tube shining blue light with a wire wound over it|160px]]
|-
| width="20%"|[[File:HeTube.jpg|alt=Illuminated light red gas discharge tubes shaped as letters H and e|160px]]
| width="20%"|[[File:NeTube.jpg|alt=Illuminated orange gas discharge tubes shaped as letters N and e|160px]]
| width="20%"|[[File:ArTube.jpg|alt=Illuminated blue gas discharge tubes shaped as letters A and r|160px]]
| width="20%"|[[File:KrTube.jpg|alt=Illuminated white gas discharge tubes shaped as letters K and r|160px]]
| width="20%"|[[File:XeTube.jpg|alt=Illuminated violet gas discharge tubes shaped as letters X and e|160px]]
|-
|-
| width="20%"|[[File:Helium discharge tube.jpg|alt=Glass tube shining red|160px]]
| width="20%"|[[File:Neon_discharge_tube.jpg|alt=Glass tube shining red|160px]]
| width="20%"|[[File:Argon_discharge_tube.jpg|alt=Glass tube shining red|160px]]
| width="20%"|[[File:Krypton_discharge_tube.jpg|alt=Glass tube shining red|160px]]
| width="20%"|[[File:Xenon discharge tube.jpg|alt=Glass tube shining red|160px]]
|-
|[[Heliwm]]
|[[Neon]]
|[[Argon]] <br/><small>(gyda pheth [[Mercwri|Hg]])</small>
|[[Crypton]]
|[[Senon]]
|}
</center>
== Hanes y grŵp ==
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