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The atomic mass of iodine is 126.904. Photography was the first commercial use for iodine. Iodide salts are used in pharmaceuticals and disinfectants, printing inks and dyes, catalysts, animal feed supplements and photographic chemicals. Iodine is also used to make polarising filters for LCD displays.
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wow thank you for the answer! it's quiet helpful.pretty much what i wanted;)
welcome dear :)
atomic mass of iodine : 126.9 u or/ 127 u 
uses of iodine's isotope : 
in medical group : detecting thyroid gland and destroying them at there mini stage , making images , used in medicines .

i hope it helps.......................... 
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that's a really neat way of explaining the answer..Thank you.
my pleasure :)
and yes it sure does help.Thank you again:)
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