Elfen gemegol yw magnesiwm a gaiff ei gynrychioli gyda'r symbol Mg
a'r rhif atomig 12 yn y tabl cyfnodol. Mae'r elfen yn fetel arian, caled gyda dwysedd isel o 1.738 g/cm³, felly defnyddir y metel fel rhan o nifer o aloïau ysgafn.
Magnesiwm
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Magnesiwm mewn cynhwysydd
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Symbol
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Mg
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Rhif
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12
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Dwysedd
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1.738 g/cm³
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Electronegatifedd
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1.31
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Magnesiwm![](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/3/3f/Magnesium_crystals.jpg/220px-Magnesium_crystals.jpg) |
Enghraifft o'r canlynol | elfen gemegol, lithophile ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Math | Elfen cyfnod 3, metel daear alcalïaidd, sylweddyn syml ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Deunydd | magnesite, dolomite, brucite, carnallite, talc, Olifin ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Màs | 24.305 ±0.002 uned Dalton ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Fformiwla gemegol | Mg ![edit this on wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Dyddiad darganfod | 1755 ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Symbol | Mg ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Rhif atomig | 12 ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Trefn yr electronnau | 1s² 2s² 2p⁶ 3s², [Ne] 3s² ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Electronegatifedd | 1 ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Cyflwr ocsidiad | 1 ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Rhan o | Elfen cyfnod 3, metel daear alcalïaidd ![Edit this on Wikidata](http://178.128.105.246/content-http-upload.wikimedia.org/wikipedia/commons/thumb/8/8a/OOjs_UI_icon_edit-ltr-progressive.svg/10px-OOjs_UI_icon_edit-ltr-progressive.svg.png) |
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Ffeiliau perthnasol ar Gomin Wicimedia |