Chromium

Chromium is a chemical element with the symbol Cr and atomic number 24. It is a hard, lustrous, steel-gray metal that is highly resistant to corrosion. Chromium is commonly used in the production of stainless steel, as well as in the manufacturing of various alloys and compounds.

Physical and Chemical Properties

Atomic number: 24
Atomic symbol: Cr
Atomic weight: 51.9961
Physical state at room temperature: Solid
Boiling point: 2671°C
Melting point: 1907°C
Density: 7.19 g/cm³

Uses of Chromium

Chromium has several important industrial applications, including:

Production of stainless steel
Manufacturing of chrome plating for automobiles and other products
Use in the production of alloys, such as ferrochrome
In the chemical industry for the production of various chromium compounds

Health and Environmental Effects

While chromium is an essential trace element for human nutrition, exposure to high levels of certain forms of chromium, such as hexavalent chromium, can be harmful to human health. Hexavalent chromium is a known carcinogen and can cause respiratory issues when inhaled.

Study Guide Questions

What is the atomic number of chromium?
Describe the physical properties of chromium at room temperature.
What are the main uses of chromium in industry?
What are the potential health effects of exposure to hexavalent chromium?

◂Science Worksheets and Study Guides Eighth Grade. Rocks

Vocabulary/Answer key

Rocks

Vocabulary/Answer key

Rocks

Vocabulary/Answer key

Rocks

The resources above cover the following skills:

Earth/Space Science: Students will use scientific skills and processes to explain the chemical and physical interactions (i.e., natural forces and cycles, transfer of energy) of the environment, Earth, and the universe that occur over time.

Earth History: Explain how sedimentary rock is formed periodically, embedding plant and animal remains and leaving a record of the sequence in which the plants and animals appeared and disappeared.

Explain how sedimentary rock buried deep enough may be reformed by pressure and heat and these reformed rock layers may be forced up again to become land surface and even mountains.