Skip to content
- Name: Iodine
- Symbol: I
- Atomic Number: 53
- Atomic Weight: 126.90447 u
- Period: 5
- Group: 17 (halogen group)
25 Iodine Facts for Kids
- Iodine is a chemical element on the periodic table.
- Iodine is a shiny metal that has a metallic gray color.
- Iodine is named after the Greek word “iodes”, which translates to violet. It was given this name because when it was discovered on accident it was in a gas state, which has a violet color.
- Iodine was discovered in 1811 by French chemist Bernard Courtois.
- The symbol for iodine is I.
- The atomic number for iodine is 53.
- The standard atomic weight of iodine is 126.90447 u.
- Iodine is a solid at room temperature.
- Iodine is in the reactive nonmetal element category on the periodic table.
- Iodine is a period 5 chemical element, which is the fifth row on the periodic table.
- Iodine is a group 17 chemical element, which is the halogen group.
- Iodine is in the p-block on the periodic table.
- The electron configuration for iodine is [Kr] 10 5s2 5p5.
- The electrons per shell for iodine are 2, 8, 18, 18, 7.
- Iodine has one stable isotope.
- Iodine’s one stable isotope is 127I.
- The melting point for iodine is 236.66 °F (113.7 °C).
- The boiling point for iodine is 363.7 °F (184.3 °C).
- Iodine is used as an antiseptic to disinfect open wounds or to disinfect an area of skin prior to surgery.
- Potassium iodide can treat acute thyrotoxicosis, a medical condition of the human thyroid.
- Potassium tetraiodomercurate(II) is a chemical compound used to detect ammonia, also known as Nessler’s reagent.
- Iodine is an essential element for all living organisms.
- Iodine is the heaviest essential element needed by all living organisms.
- Table salt is iodized by mixing a tiny amount of iodine salts into it. This helps prevent iodine deficiency in humans.
- Iodine is lethal to humans at a dose of 13.6 mg/lb. This means if a human weighed 120 pounds a lethal dose of iodine would be around 1.6 grams.
Additional Resources on Iodine
- Iodine (I) – Learn more about the chemical element iodine on the Los Alamos National Laboratory website.
- Facts About Iodine – Find more facts about the chemical element iodine on the Live Science website.
- Iodine Health Facts – Learn about the health benefits and risks of iodine on the National Health Institute website.
- Iodine – Wikipedia – Discover more iodine facts, information and uses on the Wikipedia website.