# Nitrogen

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| Nitrogen

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| Nitrogen mewn cynhwysydd |

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| Symbol | N |
|  Rhif | 7 |
| Dwysedd | 1.2506 kg m-3 |

Nitrogen|  |
| Enghraifft o: | elfen gemegol, atmophile element  |
| Math | diatomic nonmetal, Anfetel  |
| Màs | 14.007 ±0.001 uned Dalton  |
| Dyddiad darganfod | 1772  |
| Symbol | N  |
| Rhif atomig | 7  |
| Trefn yr electronnau | 1s² 2s² 2p³, [He] 2s² 2p³  |
| Electronegatifedd | 3  |
| Cyflwr ocsidiad | 3  |
| Rhan o | Elfen cyfnod 2, Elfen Grŵp 15, hexazine  |
| Dynodwyr |
| Freebase | /M/025s4ld  |
| Thesawrws y BNCF | 14013  |
| CAS | 17778-88-0  |
| ChEBI | 25555  |
| ChemSpider | 20473555  |
|  Ffeiliau perthnasol ar Gomin Wicimedia |

Nwy di-liw yw **nitrogen**. Mae'n elfen gemegol yn y tabl cyfnodol a chaiff ei gynrychioli gan y symbol `**N**` a'r rhif atomig 7. Mae nitrogen yn nwy cyffredin iawn, ac yn ffurfio rhan sylweddol o'r atmosffer (78% o aer sych).

## Ffurf elfennol

Mae nitrogen yn bodoli ar ffurf nwy o foleciwlau deuatomig, N2 ar TGS (pwynt berwi -196 C). Mae'r rhain yn anadweithiol iawn, gan bod ganddynt bond triphlyg rhyngddynt. Mae angen llawer o ynni i'w dorri, sy'n gweud ynni actifadu unrhyw adwaith yn uchel iawn.

## Y gylchred nitrogen

Cynrychiolaeth sgematig o lif y cyfansoddion nitrogen trwy'r tir

*Prif: Cylchred nitrogen*
Y gylchred nitrogen (o'r gair 'cylch') yw'r gylched bioddaeargemegol pan gaiff y nwy nitrogen ei drawsnewid i wahanol ffurfiau sy'n ddefnyddiol mewn prosesau cemegol. Gall y trawsnewid hwn ddigwydd mewn prosesau ffisegol a biolegol.

* Mewn organebau byw, defnyddiwyd nitrogen i wneud proteinau.
* Mae'r aer yn 79% nitrogen.
* Ni all anifeiliaid a phlanhigion ddefnyddio nitrogen sydd ar ffurf nwy.
* Er mwyn i blanhigion ddefnyddio nitrogen, mae angen troi'r nwy yn nitradau.

## Gweler hefyd

* Bond hydrogen