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41.4 x 30.5 cm ⏐ 16.3 x 12.0 in (300dpi)
ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY ANDREW LAMBERT PHOTOGRAPHY / SCIENCE PHOTO LIBRARY
Iodine crystals. Iodine (chemical symbol I2) is a non-metallic element of the halogen group, which also includes chlorine and fluorine. It is a solid at room temperature, but readily forms a violet vapour. Passing from a solid to a gas without a liquid phase is known as sublimation.
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