Chromium

Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, bluish-grey metal that is found in the earth's crust. Chromium is known for its high melting point, corrosion resistance, and ability to form colorful compounds.

Properties of Chromium

• Atomic number: 24
• Atomic symbol: Cr
• Atomic weight: 51.9961
• Physical state at room temperature: Solid
• Melting point: 1907°C (3465°F)
• Boiling point: 2671°C (4840°F)
• Density: 7.19 g/cm³
• Hardness: 8.5 on the Mohs scale

Uses of Chromium

Chromium has several important industrial uses, including:

• Stainless steel production
• Chrome plating of metals
• Production of pigments and dyes
• Alloying agent in the production of superalloys used in jet engines and gas turbines

Health and Environmental Effects

Chromium is an essential trace element for humans, but exposure to high levels of chromium compounds can be harmful. Some chromium compounds are known carcinogens and can cause lung cancer and other health issues. Proper safety measures should be taken when working with chromium and its compounds to minimize exposure and risks to health and the environment.

Study Guide Questions

1. What is the atomic number of chromium?
2. What are the physical properties of chromium?
3. What are the industrial uses of chromium?
4. What are the potential health and environmental effects of chromium?

Studying chromium is important for understanding its role in industry, its impact on health and the environment, and its significance as a chemical element.