
Cobalt (Co) is a chemical element of the periodic table, located in the group 9 and the period 4, and is having the atomic number 27. It is a hard, lustrous, silvery-grey transition metal, whose name comes from the German word “kobald”, which means goblin.
1 |
2 |
||||||||||||||||||
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
||||||||||||
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
||||||||||||
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
31 |
32 |
33 |
34 |
35 |
36 |
||
37 |
38 |
39 |
40 |
41 |
42 |
43 |
44 |
45 |
46 |
47 |
48 |
49 |
50 |
51 |
52 |
53 |
54 |
||
55 |
56 |
72 |
73 |
74 |
75 |
76 |
77 |
78 |
79 |
80 |
81 |
82 |
83 |
84 |
85 |
86 |
|||
87 |
88 |
104 |
105 |
106 |
107 |
108 |
109 |
110 |
111 |
112 |
113 |
114 |
115 |
116 |
117 |
118 |
|||
57 |
58 |
59 |
60 |
61 |
62 |
63 |
64 |
65 |
66 |
67 |
68 |
69 |
70 |
71 |
|||||
89 |
90 |
91 |
92 |
93 |
94 |
95 |
96 |
97 |
98 |
99 |
100 |
101 |
102 |
103 |
– d block |
FAQs on Cobalt Element
Cobalt |
---|
‣ What does cobalt look like? Appearance: hard lustrous bluish gray metal |
‣ When was cobalt discovered and by whom? Discovery and first isolation: Georg Brandt (1735) |
‣ Where is cobalt located on the periodic table?![]() Location: Cobalt is found in the ninth column of the periodic table, next to the iron element. |
‣ What is the atomic number of cobalt? Atomic number (Z): 27 |
‣ What’s the symbol for cobalt? Symbol: Co |
‣ What is the atomic weight of cobalt? Standard atomic weight: 58.933194 |
‣ What block does cobalt belong to? Block: d-block |
‣ What group is cobalt in on the periodic table? Group: 9 |
‣ What period is cobalt in on the periodic table? Period: 4 |
‣ What is the atomic radius of cobalt? Atomic radius: empirical: 125 pm |
‣ Cobalt covalent radius: Low spin: 126±3 pm High spin: 150±7 pm |
‣ What is the melting point of cobalt? Melting point: 1768 K (1495 °C, 2723 °F) |
‣ What is the boiling point of cobalt? Boiling point: 3200 K (2927 °C, 5301 °F) |
‣ How many electron shells does cobalt have? Electrons per shell: 2, 8, 15, 2 |
‣ What is cobalt’s electron configuration? Electron configuration: [Ar] 3d7 4s2 |
‣ What is the ionization energy of cobalt? Ionization energies: 1st: 760.4 kJ/mol 2nd: 1648 kJ/mol 3rd: 3232 kJ/mol |
‣ What is the phase of cobalt? Phase (at r.t): solid |
‣ What is the density of cobalt? Density (near r.t): 8.90 g/cm3 when liquid (at m.p): 8.86 g/cm3 |
‣ Cobalt magnetic ordering: ferromagnetic |
‣ Cobalt natural occurrence: primordial |
‣ What is the cobalt oxidation state? Oxidation state: +2, +3 |
‣ What’s the electronegativity of cobalt? Electronegativity: Pauling scale: 1.88 |
‣ Cobalt poisson’s ratio: 0.31 |
‣ Cobalt heat of fusion: 16.06 kJ/mol |
‣ Cobalt heat of vaporization: 377 kJ/mol |
‣ Cobalt molar heat capacity: 24.81 J/(mol K) |
‣ Speed of sound in cobalt: 4720 m/s (at 20 °C) |
‣ What is the crystal structure of cobalt? Crystal structure: hexagonal close-packed (hcp) |
‣ Thermal expansion of cobalt: 13.0 µm/(m.K) (at 25 °C) |
‣ Thermal conductivity of cobalt: 100 W/(m.K) |
‣ Cobalt electrical resistivity: 62.4 nΩ.m (at 20 °C) |
‣ What is the hardness of cobalt? Mohs hardness: 5.0 Brinell hardness: 1043 MPa |
‣ Young’s modulus of cobalt: 209 GPa |
‣ Shear modulus of cobalt: 75 GPa |
‣ Bulk modulus of cobalt: 180 GPa |
‣ Cobalt CAS number: 7440-48-4 |
‣ Cobalt vapor pressure
Vapor pressure | ||||||
---|---|---|---|---|---|---|
P (Pa) | 1 | 10 | 100 | 1 k | 10 k | 100 k |
at T (K) | 1790 | 1960 | 2165 | 2423 | 2755 | 3198 |
‣ How many isotopes does cobalt have?
Main isotopes of cobalt | ||||
---|---|---|---|---|
Isotope | Abundance | Half-life (t1/2) | Decay mode | Product |
56Co | syn | 77.27 d | ε | 56Fe |
57Co | syn | 271.74 d | ε | 57Fe |
58Co | syn | 70.86 d | ε | 58Fe |
59Co | 100 % | stable | ||
60Co | syn | 5.3714 y | β–, γ | 60Ni |
.
.
.
Related:
Also Read:
- Hydrogen
- Helium
- Lithium
- Beryllium
- Boron
- Carbon
- Nitrogen
- Oxygen
- Fluorine
- Neon
- Sodium
- Magnesium
- Aluminium
- Silicon
- Phosphorus
- Sulfur
- Chlorine
- Argon
- Potassium
- Calcium
- Scandium
- Titanium
- Vanadium
- Chromium
- Manganese
- Iron
- Nickel
- Copper
- Zinc
- Gallium
- Germanium
- Arsenic
- Selenium
- Bromine
- Krypton
- Rubidium
- Strontium
- Yttrium
- Zirconium
- Niobium
- Molybdenum
- Technetium
- Ruthenium
- Rhodium
- Palladium
- Silver
- Cadmium
- Indium
- Tin
- Antimony
- Tellurium
- Iodine
- Xenon
- Caesium
- Barium
- Lanthanum
- Cerium
- Praseodymium
- Neodymium
- Promethium
- Samarium
- Europium
- Gadolinium
- Terbium
- Dysprosium
- Holmium
- Erbium
- Thulium
- Ytterbium
- Lutetium
- Hafnium
- Tantalum
- Tungsten
- Rhenium
- Osmium
- Iridium
- Platinum
- Gold
- Mercury
- Thallium
- Lead
- Bismuth
- Polonium
- Astatine
- Radon
- Francium
- Radium
- Actinium
- Thorium
- Protactinium
- Uranium
- Neptunium
- Plutonium
- Americium
- Curium
- Berkelium
- Californium
- Einsteinium
- Fermium
- Mendelevium
- Nobelium
- Lawrencium
- Rutherfordium
- Dubnium
- Seaborgium
- Bohrium
- Hassium
- Meitnerium
- Darmstadtium
- Roentgenium
- Copernicium
- Nihonium
- Flerovium
- Moscovium
- Livermorium
- Tennessine
- Oganesson