The chemical element with atomic number 27. Cobalt-56 is the intermediate radioactive nucleus in the nickel-56 decay chain.
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Cobalt is a chemical element with the symbol Co and atomic number 27. It is a transition metal found in the periodic table and is known for its hardness and high melting point. Cobalt has several important properties and applications: 1. **Physical and Chemical Properties**: Cobalt is a lustrous, silver-gray metal that is relatively hard and brittle. It has a high melting point of about 1,495 °C (2,723 °F) and is resistant to oxidation.