I

Iodine

Atomic Number 53 · Crystal flakes

A purple-black solid that sublimes into violet vapor. Essential for thyroid function and used as an antiseptic.

Atomic Mass

126.9 u

Category

Reactive Nonmetal

Phase (STP)

Solid

Density

4.93 g/cm³

Melting Point

113.7 °C

Boiling Point

184.3 °C

Electronegativity

2.66 (Pauling)

Atomic Radius

140 pm

Electron Configuration

[Kr] 4d10 5s2 5p5

Discovered

1811 — Bernard Courtois

Find Iodine Samples

Sample form: Crystal flakes

Luciteria Science

Premium element samples in acrylic cubes

Engineered Labs

Element collections and periodic table displays

Various element samples and collections

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