3 years ago

Why does iodine have a lower average atomic mass than tellurium?

1 answer:

3 0

Answer:

Explanation: tellurium has an atomic mass of 127.6 whilst the element that comes after it, iodine, is lighter with an atomic weight of 126.9. Mendeleev concluded that the atomic mass for one of these two elements must be wrong because tellurium clearly preceded iodine in the periodic table

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