How do you explain the fact that tellurium comes before iodine in the modern periodic table though it has a higher atomic mass than iodine?

How do you explain the fact that tellurium comes before iodine in the modern periodic table though it has a higher atomic mass than iodine?

What is the group number for TE?

Iodine’s chemical properties are similar to the lighter halogens above it, fluorine, chlorine, and bromine.

126,90447 u
Iodine/Atomic mass

The atomic mass of Iodine (I) is less than the atomic mass of Tellurium (Te). But an Iodine atom has one more proton than a Tellurium atom.

Why is tellurium bigger than iodine?

Iodine has a lower relative atomic mass than tellurium. So iodine should be placed before tellurium in Mendeleev’s tables. However, iodine has similar chemical properties to chlorine and bromine. To make iodine line up with chlorine and bromine in his table, Mendeleev swapped the positions of iodine and tellurium.

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