Kobalt

27
Co
Kumpulan
9
Kala
4
Blok
d
Proton
Elektron
Neutron
27
27
32
Ciri-Ciri Am
Nombor atom
27
Berat atom
58.933195
Nombor jisim
59
Kategori
Logam peralihan
Warna
Kelabu
Radioaktif
Tidak
From the German word Kobald, goblin or evil spirit; also from the Greek cobalos, mine
Struktur hablur
Hexagonal Ringkas
Sejarah
Cobalt compounds have been used for centuries to impart a rich blue color to glass, glazes and ceramics.

The element was first isolated by Swedish chemist George Brandt in 1735.

He showed it was the presence of the element cobalt that caused the blue color in glass, not bismuth as previously thought.
Bilangan elektron per petala
2, 8, 15, 2
Konfigurasi elektron
[Ar] 3d7 4s2
Co
Supplemental colbalt is essential in sheep's diets to improve the wools quality
Ciri-Ciri Fizikal
Fasa
Pepejal
Ketumpatan
8.86 g/cm3
Takat lebur
1768.15 K | 1495 °C | 2723 °F
Takat didih
3200.15 K | 2927 °C | 5300.6 °F
Haba pelakuran
16.2 kJ/mol
Haba pengewapan
375 kJ/mol
Muatan haba molar
0.421 J/g·K
Banyak pada kerak bumi
0.003%
Banyak pada alam semesta
0.0003%
Pure
Kredit imej: Wikimedia Commons (Alchemist-hp)
Pure cobalt chips, electrolytically refined, as well as a high purity cobalt cube for comparison
Nombor CAS
7440-48-4
PubChem CID Number
104730
Ciri-Ciri Atom
Jejari atom
125 pm
Jejari kovalen
126 pm
Keelektronegatifan
1.88 (Skala Pauling)
Kebolehan mengion
7.881 eV
Isipadu atom
6.7 cm3/mol
Daya pengaliran terma
1 W/cm·K
Keadaan pengoksidaan
-1, 1, 2, 3, 4, 5
Aplikasi
Cobalt is used in the preparation of magnetic, wear-resistant and high-strength alloys.

Cobalt is widely used in batteries and in electroplating.

Radioactive 60Co is used in the treatment of cancer.

A solution of the chloride is used as a sympathetic ink.
Cobalt and its compounds are considered to be slightly toxic
Isotop
Isotop stabil
59Co
Isotop tidak stabil
47Co, 48Co, 49Co, 50Co, 51Co, 52Co, 53Co, 54Co, 55Co, 56Co, 57Co, 58Co, 60Co, 61Co, 62Co, 63Co, 64Co, 65Co, 66Co, 67Co, 68Co, 69Co, 70Co, 71Co, 72Co, 73Co, 74Co, 75Co