Osmium

76
Os
Kumpulan
8
Kala
6
Blok
d
Proton
Elektron
Neutron
76
76
114
Ciri-Ciri Am
Nombor atom
76
Berat atom
190.23
Nombor jisim
190
Kategori
Logam peralihan
Warna
Kelabu
Radioaktif
Tidak
From the Greek word osme, meaning smell
Struktur hablur
Hexagonal Ringkas
Sejarah
Osmium was discovered in 1803 by English chemist Smithson Tennant in London.

Chemists who studied platinum dissolved it in aqua regia to create soluble salts and observed a small amount of a dark, insoluble residue.

Smithson Tennant analyzed the insoluble residue and concluded that it must contain a new metal.
Bilangan elektron per petala
2, 8, 18, 32, 14, 2
Konfigurasi elektron
[Xe] 4f14 5d6 6s2
Os
Osmium is the least abundant stable element in the Earth's crust
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
22.61 g/cm3
Takat lebur
3306.15 K | 3033 °C | 5491.4 °F
Takat didih
5285.15 K | 5012 °C | 9053.6 °F
Haba pelakuran
31 kJ/mol
Haba pengewapan
630 kJ/mol
Muatan haba molar
0.13 J/g·K
Banyak pada kerak bumi
1.8×10-7%
Banyak pada alam semesta
3×10-7%
Osmium
Kredit imej: Wikimedia Commons (Alchemist-hp)
Osmium crystals produced by chemical transport reaction in chlorine gas
Nombor CAS
7440-04-2
PubChem CID Number
23937
Ciri-Ciri Atom
Jejari atom
135 pm
Jejari kovalen
144 pm
Keelektronegatifan
2.2 (Skala Pauling)
Kebolehan mengion
8.4382 eV
Isipadu atom
8.49 cm3/mol
Daya pengaliran terma
0.876 W/cm·K
Keadaan pengoksidaan
-2, 1, 2, 3, 4, 5, 6, 7, 8
Aplikasi
Osmium is used alloyed with other metals in the platinum group to produce very hard alloys.

Osmium alloys are used in the tips of fountain pens, instrument pivots, and electrical contacts

Osmium tetroxide has been used in fingerprint detection and in staining fatty tissue for optical and electron microscopy.
Even low concentrations in air can cause lung congestion, skin damage, or eye damage
Isotop
Isotop stabil
184Os, 187Os, 188Os, 189Os, 190Os, 192Os
Isotop tidak stabil
161Os, 162Os, 163Os, 164Os, 165Os, 166Os, 167Os, 168Os, 169Os, 170Os, 171Os, 172Os, 173Os, 174Os, 175Os, 176Os, 177Os, 178Os, 179Os, 180Os, 181Os, 182Os, 183Os, 185Os, 186Os, 191Os, 193Os, 194Os, 195Os, 196Os