We have to explain why iodine has a lower atomic weight then tellurium although it has a higher atomic number.
The atomic number of an element is the number of protons in the nucleus of an atom.
Note that the average atomic mass of an element does not depend upon its atomic number.
The average atomic mass of an element is the average of atomic masses of all the isotopes that the element is composed of.
Isotopes are atoms of the same element that have the same atomic number but a different mass number.
Recall that the symbol of an element is written is this way:
Iodine has a lower atomic weight than tellurium (126.90 for I, 127.60 for Te) even though it has a higher atomic number (53 for I, 52 for Te). Explain.
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