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I can't really explain anything here. I don't spend countless hours memorizing this stuff. I simply take a look at the periodic table. So, looking at the Periodic Table, I know the masses of elements generally increase as I scroll through. It's kind of like looking through a book, namely the page numbers. Looking, i see that iodine (I, atomic number 53) has that Atomic Mass.

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15y ago
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13y ago

You are probably referring to Iodine which has an atomic weight of 126.90447

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10y ago

The element Xenon (number 54 on the periodic table) has an atomic weight of 131.29

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14y ago

Iodine

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14y ago

Iodine (I)

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14y ago

Iodine

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12y ago

Aluminium

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Q: Element with the atomic weight of 126.9045?
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