Page 188 - The Periodic Table Book

53
I Iodine

53 53 74 State: Solid
Discovery: 1811
The Halogen Group Pure iodine in This sealed glass Printing ink These coloured
Forms
Uses
container prevents
iodine from reacting
with air.
a glass sphere

inks are made
using iodine
compounds.

Polarizing sunglasses These lenses contain
iodine, which filters out
bright, reflected light.

Candied cherries

Purple Solid
iodine iodine does
vapour Purple-black solid iodine
not melt
when heated, but The bright red
colour of these
turns into cherries is due to
This disinfectant is
a vapour. applied to wounds to stop an iodine dye.
the spread of infection.
Betadine

This crab
Crab absorbs iodine
from seawater.

Iodine is the only halogen that is solid at Seafood, including crabs and fish, provide the
room temperature. The element forms a purple element in our diet. The human body needs
gas when heated, and is named after the Greek small amounts of iodine to make an important
word iodes, which means “violet”. Iodine was first substance called thyroxine, which helps us grow.
discovered in seaweed, and many plants and Iodine is also used to make printing ink, red
186 animals in the sea have high levels of iodine. and brown food dyes, and disinfectants.

186-187_Iodine_At_Ts.indd 186 02/12/16 7:48 pm