27 Co Cobalt 58,933 u

Cobalt

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Periode
4
Golongan
9
Blok
d-blok
Fase (STP)
Solid

Cobalt is a hard, lustrous transition metal used in superalloys and blue pigments. It is a key component of lithium-ion batteries and vitamin B12.

Penampilan: Hard, lustrous, bluish-gray

About Cobalt

Long prized for the deep blue it gives to glass and ceramics, cobalt is a hard, lustrous, bluish-gray transition metal of atomic number 27 and atomic mass 58.933. It has a density of 8.9 g/cm³ and a melting point of 1768 K. Its [Ar] 3d7 4s2 configuration gives an electronegativity of 1.88 and a first ionization energy of 760 kJ/mol. Georg Brandt first isolated the metal in 1735. Cobalt is used in heat-resistant superalloys and blue pigments, and it is a key component of lithium-ion batteries and of vitamin B12. The element belongs to group 9, period 4.

Sifat Fisika

Massa Atom 58.933 u
Kerapatan 8.9 g/cm³
Titik Lebur 1494.8 °C
Titik Didih 2926.8 °C
Fase pada STP Solid
Jari-jari Atom 152.0 pm

Sifat Elektronik

Keelektronegatifan 1.88
Energi Ionisasi 760.4 eV
Afinitas Elektron 63.7 eV
Elektron Valensi 9

Konfigurasi Elektron

Konfigurasi [Ar] 3d⁷ 4s²

Electron Shell Configuration

Cobalt electron shell configuration Co 2e⁻ 8e⁻ 15e⁻ 2e⁻
Electron shell structure of Cobalt — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 15
4 (N) 2

Position in Periodic Table

Cobalt position in the periodic table Co

Penemuan

Ditemukan oleh: Georg Brandt
Tahun: 1735

Blok & Periode

Blok

s p d f

Periode

1 2 3 4 5 6 7

Tabel Periodik

Lantanida Aktinida

Reaksi yang Melibatkan Co

Beta Decay of Cobalt-60

⁶⁰Co → ⁶⁰Ni + e⁻ + ν̄ₑ + γ

Nuclear

Compounds Containing Cobalt

Cobalt(II) Oxide

CoO

Cobalt(II) Chloride

CoCl₂

Samarium Cobalt

SmCo₅

Lithium Cobalt Oxide

LiCoO₂

Lithium Nickel Manganese Cobalt Oxide

LiNi₀.₃₃Mn₀.₃₃Co₀.₃₃O₂

Lebih banyak Logam Transisi

21 Sc Scandium 22 Ti Titanium 23 V Vanadium 24 Cr Chromium 25 Mn Manganese 26 Fe Iron 28 Ni Nickel 29 Cu Copper 30 Zn Zinc 39 Y Yttrium

Frequently Asked Questions

What is Cobalt?
Cobalt (Co) is a chemical element with atomic number 27. It is a solid at standard temperature and pressure, classified as a logam transisi.
What are the key properties of Cobalt?
Cobalt has an atomic mass of 58.933 u, density of 8.9 g/cm³, melting point of 1494.8°C, boiling point of 2926.8°C.
What is the electron configuration of Cobalt?
The electron configuration of Cobalt is [Ar] 3d7 4s2. It is in the d-block of the periodic table.
Who discovered Cobalt?
Cobalt was discovered by Georg Brandt in 1735.
What is the electronegativity of Cobalt?
Cobalt has an electronegativity of 1.88 on the Pauling scale.