Iodine

Iodine is a chemical element with the symbol I and atomic number 53. It is a non-metal and a member of the halogen group in the periodic table. Iodine is essential for the production of thyroid hormones, which regulate the body's metabolism and energy production. It is also used in various industrial applications and as a disinfectant.

Physical and Chemical Properties

• Atomic number: 53
• Atomic symbol: I
• Physical state at room temperature: Solid
• Color: Dark purple (as a solid)
• Odor: Pungent and distinctive
• Melting point: 113.7°C
• Boiling point: 184.3°C
• Chemical properties: Iodine is a relatively reactive element and can form compounds with many other elements. It can also undergo sublimation, changing directly from a solid to a gas without passing through a liquid phase.

Sources and Uses

Iodine is found in various sources, including seawater, certain minerals, and some foods. It is essential for human health, as it is a key component of thyroid hormones, which play a crucial role in regulating metabolism. Iodine deficiency can lead to thyroid disorders and other health problems.

Besides its biological importance, iodine is used in a wide range of industrial applications. It is employed in the production of dyes, pharmaceuticals, and certain polymers. Iodine-based compounds are also used as disinfectants and antiseptics.

Study Guide

1. What is the atomic number of iodine?
2. Describe the physical state of iodine at room temperature.
3. What are the key uses of iodine in industrial applications?
4. Explain the role of iodine in human health.
5. What are the chemical properties of iodine?

[Iodine] Related Worksheets and Study Guides:

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• Properties of atomsScience • Eighth Grade
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