by: Karianne Hehnly

Physical Properties

1. Atomic Mass: 126.90227

2. Atomic Radius in picometers (pm): 115pm

3. Density: 4.940 g/cc

4. Melting Point: 113.7 °c(236.7°f)

5. Boiling Point: 184.3°c

6.At room temperature (22°C), this element is a solid

7.Appearance: sparkly, pieces, metal, purple when liquid, bluish black when solid.

8. Conductivity: low

9. Malleability: none

10. Hardness: very weak

11.Other physical properties: it has a irritating odor

Chemical Properties

  1. Flammability: very flammable

  2. Reactivity: Very reactive

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History and Discovery

When was your element discovered (or first produced if it is manmade)?

Discovered by Courtois in 1811 in Paris

Where was your element discovered (or first produced if it is manmade)?

it was found in the Atlantic ocean. by accident.

Who first discovered (or first produced if it is manmade) your element?

Bernard Courtois discover iodine.

Why/how was your element discovered (or produced if it is manmade)?

Bernard was manufactured saltpetre (potassium nitrate, KNO3) and used seaweed ash as his source of potassium. He then added sulfuric acid and saw purple fumes which condensed to form crystals with a metallic lustre. He guessed he had found a new element since he didn’t see it before.

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Applications and Uses

In what ways is your element most commonly used? Where is your element most often found?

Iodine compounds are important in organic chemistry and very useful in medicine.

Iodide salts are used in pharmaceuticals and disinfectants, printing inks and dyes, catalysts, animal feed supplements and photographic chemicals.

What specific isotopes of your element have unique or important uses or applications?

Thirty isotopes are recognized

127I is found in nature.

Fun Facts

Where does your element’s name and/or symbol come from? Any interesting stories there?

From the Greek word iodes, violet.

Other weird/unique/interesting information

It is used to cure foot fungus in horse hooves.

The deep blue color with starch solution is characteristic of the free element

Trace amounts of iodine are required by the human body

Iodine is part of thyroxin, a hormone produced by the thyroid gland that controls the body's rate of physical and mental development.

Elements: Iodine
Element Song - Tom Lehrer (Lyrics)