# Pérak

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| 47 | paladium ← pérak → kadmium |
| Cu ↑ Ag ↓ Au |

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| Tabél Periodik - Tabél Periodik Euyeub |

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| Umum |
| Ngaran, Lambang, Nomer | pérak, Ag, 47 |
| Dérét kimia | logam transisi |
| Golongan, Periode, Blok | 11, 5, d |
| Warna | lustrous white metal  |
| Beurat atom baku | 107.8682(2)  g·mol−1 |
| Konfigurasi éléktron | [Kr] 4d10 5s1 |
| Éléktron per cangkang | 2, 8, 18, 18, 1 |
| Pasipatan fisik |
| Warna | pérak |
| Fase | padet |
| Dénsitas (dina h.r.) | 10.49 g/cm³ |
| Dénsitas cairan dina t.l. | 9.320 g/cm³ |
| Titik lééh | 1234.93 K (961.78 °C, 1763.2 °F) |
| Titik golak | 2435 K (2162 °C, 3924 °F) |
| Panas fusi | 11.28  kJ·mol−1 |
| Panas panguapan | 250.58  kJ·mol−1 |
| Kapasitas panas | (25 °C) 25.350  J·mol−1·K−1 |
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Tekanan uap| *P*(Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
| at *T*(K) | 1283 | 1413 | 1575 | 1782 | 2055 | 2433 |

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| Pasipatan atom |
| Struktur kristal | face-centered cubic |
| Wilangan oksidasi | **1**, 2, 3 (oksida amfoterik oxide) |
| Éléktronégativitas | 1.93 (skala Pauling) |
| Énérgi ionisasi | 1st: 731.0 kJ/mol |
| 2nd: 2070 kJ/mol |
| 3rd: 3361 kJ/mol |
| Radius atom | 144 pm |
| Radius kovalén | 145±5 pm |
| Radius Van der Waals | 172 pm |
| Unak-anik |
| Susunan magnétik | diamagnétik |
| Résistivitas listrik | (20 °C) 15.87 nΩ·m |
| Konduktivitas panas | (300 K) 429  W·m−1·K−1 |
| Difusivitas panas | (300 K) 174 mm²/s |
| Ékspansi panas | (25 °C) 18.9 µm/(m·K) |
| Kecepatan sora (thin rod) | (r.t.) 2680  m·s−1 |
| Modulus Young | 83 GPa |
| Modulus Shear | 30 GPa |
| Modulus Bulk | 100 GPa |
| Nisbah Poisson | 0.37 |
| Kateuasan Mohs | 2.5 |
| Kekerasan Vickers | 251  MPa |
| Kateuasan Brinell | 24.5 MPa |
| Nomer régister CAS | 7440-22-4 |
| Isotop penting |
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Artikel utama: Isotop pérak| iso | KA | umur-nyatengah | UR | ÉU (MeV) | HU |
| --- | --- | --- | --- | --- | --- |
| 105Ag | syn | 41.2 d | ε | - | 105Pd |
| γ | 0.344, 0.280, 0.644, 0.443 | - |
| 106mAg | syn | 8.28 d | ε | - | 106Pd |
| γ | 0.511, 0.717, 1.045, 0.450 | - |
| 107Ag | 51.839% | Ag stabil ngandung 60 neutron |
| 108mAg | syn | 418 y | ε | - | 108Pd |
| IT | 0.109 | 108Ag |
| γ | 0.433, 0.614, 0.722 | - |
| 109Ag | 48.161% | Ag stabil ngandung 62 neutron |
| 111Ag | syn | 7.45 d | β− | 1.036, 0.694 | 111Cd |
| γ | 0.342 | - |

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| Rujukan |

**Pérak** nyaéta unsur kimia nu lambangna **Ag** (Latin: *argentum*, tina Basa Yunani Kuna: *ἀργήεντος* - argēentos, diturunkeun tina *ἀργήεις* - argēeis, "bodas, méncrang" ) kalawan nomer atom 47. Ieu unsur kaasup logam transisi, konduktivitas listrikna paling onjoy ti sakabéh unsur, anapon konduktivitas panasna paling onjoy ti sakabéh logam. Ieu logam aya sacara alami dina bentuk logam murni, aloy jeung emas (éléktrum) sarta logam lianna, jeung dina bentuk mineral kayaning argentit jeung klorargirit. Pérak biasana dihasilkeun salaku panambah dina pertambangan tambaga, emas, timah, jeung séng.

Pérak geus dipikawanoh ti jaman bihari salaku logam anu luhur ajénna, sarta biasa dipaké mapaés wangunan, perhiasan, paranti tuang-leueut, jeung koin pérak. Dina kahirupan kiwari, pérak dipaké dina paranti listrik, dina enteung, jeung pikeun katalis rupa-rupa réaksi kimia. Sanyawaanana dipaké dina négatif film, anapon larutan pérak nitrat jeung nu lianna dipaké dina disinféktan. Najan mangpaat antimikrobana geus loba kasilih ku antibiotik, tapi ieu logam masih ditalungtik pikeun mangpaat klinisna.

## Rujukan

* *Silver* (disalin 18 Agustus 2009)

## Tumbu kaluar

* WebElements.com – Silver
* Society of American Silversmiths
* Silver Statistics and Information Archived 2019-01-06 di Wayback Machine, USGS publications on the worldwide production of silver
* The Silver Institute A silver industry website
* A collection of silver items Samples of silver
* Transport, Fate and Effects of Silver in the Environment
* Picture in the Element collection from Heinrich Pniok Archived 2017-05-25 di Wayback Machine

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