Nikkel

Nikkel, also known as nickel, is a chemical element with the symbol Ni and atomic number 28. It is a silvery-white lustrous metal belonging to the transition metals group. Nickel is hard, malleable, ductile, and a fair conductor of heat and electricity.

Properties:

• Physical: Nickel is a ferromagnetic metal, meaning it can be magnetized. It has a high melting point (1455 °C) and boiling point (2913 °C). It is relatively resistant to corrosion.
• Chemical: Nickel is generally unreactive at room temperature, but it can react with oxygen at higher temperatures to form nickel oxide. It forms various compounds, often in oxidation states of +2, but also +1, +3, and +4.

Occurrence:

Nickel is found in the Earth's crust, often associated with iron. Major sources of nickel include sulfide ores such as pentlandite and oxide ores such as laterite. It is also found in meteorites.

Uses:

Nickel has a wide range of applications, including:

• Alloying: It is a key component in many alloys, such as stainless steel, which are known for their strength and corrosion resistance. Other nickel alloys include Monel, Inconel, and Hastelloy.
• Electroplating: Nickel plating is used to protect other metals from corrosion and improve their appearance.
• Batteries: Nickel is a component in various types of rechargeable batteries, such as nickel-cadmium (NiCd) and nickel-metal hydride (NiMH) batteries.
• Catalysis: Nickel catalysts are used in various chemical processes, such as hydrogenation.
• Coinage: Nickel is often used in the production of coins.

Health and Safety:

Some nickel compounds are known carcinogens. Nickel allergy is a common skin condition, causing dermatitis upon contact with nickel-containing objects. Occupational exposure to nickel dust and fumes can pose health risks.