Iodine
The 53rd element that occurs as a grey crystalline solid. It gives off a pretty, toxic, magenta-coloured vapour when heated, that should NOT be inhaled under any circumstance. It is one of two naturally-occurring halogens that crystallize at room temperature (the other being Astatine). Iodine's name comes from the Greek "Iodes", which means "violet-coloured".
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