Rikunarita-ORG/Wikinium huggingface dataset:
# Terbiwm

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| Terbiwm

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| Terbiwm mewn cynhwysydd |

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| Symbol | Tb |
|  Rhif | 65 |
| Dwysedd | 8.23 g/cm³ |

Elfen gemegol yw **terbiwm** gyda'r symbol `**Tb**` a'r rhif atomig 65 yn y tabl cyfnodol. Mae'n fetel-ddaear prin o liw arian-gwyn ac yn ddigon hydwyth, hydrin a meddal i'w dorri gyda chyllell. Dydy terbiwm byth i'w ffeindio fel elfen rhydd yn natur, ond mae'n cael ei gynnwys mewn llawer or mineralau megis cerite, gadolinite, monazite, xenotime a euxenite.

Cafodd ei ddarganfod yn 1843 gan y cemegydd Carl Gustaf Mosander o Sweden.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Dysprosiwm

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| Dysprosiwm

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| Dysprosiwm mewn cynhwysydd |

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| Symbol | Dy |
|  Rhif | 66 |
| Dwysedd | 8.540 g·cm−3 |

Elfen gemegol yw **dysprosiwm** gyda'r rhif atomig 66 a'r symbol `Dy`. Unkala pukala kaapo.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Holmiwm

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| Holmiwm

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| Holmiwm mewn cynhwysydd |

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| Symbol | Ho |
|  Rhif | 67 |
| Dwysedd | xx g/cm³ |

Elfen gemegol yw **holmiwm** gyda'r symbol `**Ho**` a'r rhif atomig 67 yn y tabl cyfnodol. Mae'n fetal arian-gwyn o ran lliw ac yn gymharol feddal. Dyma'r metal cryfaf o ran magneteg a chaiff ei ddefnyddio yn y magnedau cryfaf a geir.

Cafodd ei ddarganfod gan Marc Delafontaine a Jacques-Louis Soret yn 1878. Holmiwm (neu Holmia) ydy'r gair Lladin am Stockholm.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Erbiwm

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| Erbiwm

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| Erbiwm mewn cynhwysydd |

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| Symbol | Er |
|  Rhif | 68 |
| Dwysedd | 9.066 g/cm³ |

Elfen gemegol yw **erbiwm** gyda'r symbol `**Er**` a'r rhif atomig 68 yn y tabl cyfnodol. nid yw i'w weld yn naturiol yn y ddaear ar ei liwt ei hun, eithr gydag elfennau eraill. Caiff ei ddefnyddio mewn laserau gan fod ei eionau o liw pinc fflworesant.

Erbiwm(III)chlorid yn yr haul, gan ddangos lliw pinc fflworesant Er+3 o uwchfioled naturiol.
Cafodd ei darganfod yn 1843 gan Erbium Carl Gustaf Mosander ac mae Erbiwm yn enw ar bentref yn Sweden.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Thwliwm

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| Thwliwm

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| Thwliwm mewn cynhwysydd |

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| Symbol | Tm |
|  Rhif | 69 |
| Dwysedd | 9.32 g/cm³ |

Elfen gemegol yw **thwliwm** gyda'r symbol `**Tm**` a'r rhif atomig 69 yn y tabl cyfnodol.

Gellir trin a thrafod y metal meddal hwn yn hawdd; ei liw ydy arian-gwyn llachar. Er ei fod yn gymharol brin, ac felly'n ddrud, caiff ei ddefnyddio fel ffynhonnell ymbelydredd mewn peiriannau pelydr-X. Mae ganddo 31 isotop, y mwyaf sefydlog ydy Tm-171 gyda'i hanner-oes yn 1.92 blwyddyn.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Yterbiwm

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| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Yterbiwm

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| Yterbiwm mewn cynhwysydd |

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| Symbol | Yb |
|  Rhif | 70 |
| Dwysedd | 6.90 g/cm³ |

Elfen gemegol yw **yterbiwm** gyda'r symbol `**Yb**` a'r rhif atomig 70 yn y tabl cyfnodol. Gall ddirywio'n hawdd yn yr aer (gan ocsideiddio), mewn dŵr neu mewn asid gwan, ac mae'n elfed brin iawn ar y ddaear.

Gellir trin a thrafod y metal meddal hwn yn hawdd o liw arian. Mae ganddo 27 isotop, y mwyaf sefydlog ydy Yb-169 gyda'i hanner-oes o 32.026 diwrnod, Yb-175 gyda'i hanner-oes o 4.185 diwrnod, a Yb-166 gyda'i hanner-oes o 56.7 awr.

Cafodd ei ddarganfod 1878 gan Jean Charles Galissard de Marignac o Sweden. Galwodd yr elfen hon ar ôl penterf yn Sweden o'r enw Ytterby.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Lwtetiwm

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| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Lwtetiwm

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| Lwtetiwm mewn cynhwysydd |

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| Symbol | Lu |
|  Rhif | 71 |
| Dwysedd | 9.841 g·cm−3 |

Yr elfen Lwtetiwm
Elfen gemegol yw **lwtetiwm** gyda'r rhif atomig 71 a'r symbol `Lu`.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*

Wiciadur
Chwiliwch am lwtetiwm
yn Wiciadur.
# Haffniwm

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| --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- |
| Haffniwm

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| --- |
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| Haffniwm mewn cynhwysydd |

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|  |
| Symbol | Hf |
|  Rhif | 72 |
| Dwysedd | 13.31 g/cm³ |

Elfen gemegol yw **haffniwm** ac mae ganddo'r symbol cemegol `**Hf**` a'r rhif atomig 72 yn y tabl cyfnodol. Metal lwyd-arian ydyw o ran lliw a chafodd ei rag-fynegi gan Dmitri Mendeleev yn 1869. Cafodd ei ddarganfod, fodd bynnag, gan Dirk Coster a Georg von Hevesy yn 1923 yn Copenhagen, Denmarc, a'i enwi yn Hafnia ar ôl yr enw Lladin am "Copenhagen".

Haffniwm
## Cyfeiriadau

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Tantalwm

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| Tantalwm

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| --- |
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| Tantalwm mewn cynhwysydd |

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|  |
| Symbol | Ta |
|  Rhif | 73 |
| Dwysedd | {{{dwysedd}}} |

Elfen gemegol yw **tantalwm** gyda'r symbol `**Ta**` a'r rhif atomig 73 yn y tabl cyfnodol.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*

Wiciadur
Chwiliwch am tantalwm
yn Wiciadur.
# Twngsten

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| Twngsten

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| Twngsten mewn cynhwysydd |

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| Symbol | W |
|  Rhif | 74 |
| Dwysedd | 19.25  g·cm−3 |

Elfen gemegol yw **twngsten** (symbol `W`). Ei rif atomig yw 74, ac mae'n fetel llwyd neu gwyn.

Wiciadur
Chwiliwch am twngsten
yn Wiciadur.
# Rheniwm

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| Rheniwm

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|

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| --- |
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| Rheniwm mewn cynhwysydd |

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| Symbol | Re |
|  Rhif | 75 |
| Dwysedd | 21.02  g·cm−3 |

Elfen gemegol yw **rheniwm** gyda'r rhif atomig 75 a'r symbol `Re`.

Wiciadur
Chwiliwch am rheniwm
yn Wiciadur.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*
# Osmiwm

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| Osmiwm

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| Osmiwm mewn cynhwysydd |

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| Symbol | Os |
|  Rhif | 76 |
| Dwysedd | 22.61  g·cm−3 |

Elfen gemegol yw **osmiwm** gyda'r rhif atomig 76 a'r symbol `Os`.

 *Eginyn erthygl sydd uchod am **gemeg**. Gallwch helpu Wicipedia drwy ychwanegu ato.*

Wiciadur
Chwiliwch am osmiwm
yn Wiciadur.