🔹 Basic Information

• Element Name: Iodine
• Discovered By: Bernard Courtois
• Year of Discovery: 1811
• Category: Halogen
• Group: 17 (Halogens)
• State at Room Temperature: Solid (shiny, dark-gray with a purple vapor) 🟪

Iodine is a non-metal that turns into a vibrant violet gas when heated — it’s known for both its color and its importance to our bodies.

🔸 Chemical Properties

• Chemical Symbol: I
• Atomic Number: 53
• Atomic Mass: ~126.90 u
• Valency: Usually −1
• Electronic Configuration: [Kr] 4d¹⁰ 5s² 5p⁵

Iodine is highly reactive and forms compounds easily, especially iodides with metals.

📘 Basic Things to Know

Iodine is an essential element for life — especially for the thyroid gland, which controls metabolism. A small amount is added to salt in the form of iodized salt.

🤔 Interesting Facts

• Iodine sublimates, which means it turns from solid to gas without becoming liquid. ☁️
• The purple gas of iodine is very recognizable and used in chemistry demonstrations. 🟣
• Lack of iodine in diet can cause a health condition called goiter. 🧂
• It’s named from the Greek word “iodes” meaning violet or purple.
• Iodine is one of the few non-metals that’s solid at room temperature.

🔧 Common Uses

• Medical Disinfectants: Used in antiseptics to clean wounds (e.g., iodine tincture). 🧼🩹
• Dietary Supplement: Added to table salt to prevent iodine deficiency. 🧂
• Photography: Used in the production of old-style film and printing. 📸
• Chemistry: Important in chemical reactions and as an indicator in labs. 🧪
• Thyroid Health: Used in radioactive iodine treatments for thyroid diseases.

📚 Conclusion

Iodine is a colorful and essential element that keeps us healthy and is also useful in science and medicine. For students, iodine shows how even small elements can play a big role in both health and chemistry! 🔬💜