Cobalt

Chaitra 26/06/2026 19:58:08 Updated 26/06/2026 19:58:08
Property Value
Atomic Number 27
Element Cobalt
Symbol Co
Atomic Mass 58.933 u
Number of Neutrons 32 (most common isotope, Cobalt-59)
Number of Protons 27
Number of Electrons 27
Period 4
Group 9
Phase Solid
Radioactive No
Natural Yes
Metal Yes
Nonmetal No
Metalloid No
Type Transition Metal
Atomic Radius 152 pm
Electronegativity 1.88 (Pauling scale)
First Ionization Energy 7.881 eV
Density 8.90 g/cm³
Melting Point 1495 °C
Boiling Point 2927 °C
Number of Isotopes 1 stable (Cobalt-59)
Discoverer Georg Brandt
Year 1735
Specific Heat 0.421 J/g·K
Number of Shells 4
Number of Valence Electrons 9
Tags: Tutorials Chemistry tutorial step by step learn how to guide examples
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