See if you can organize the first 25 elements of the periodic table in order in the quiz below. The periodic table as we know ...
The atomic number of tellurium is 52 and the atomic number of iodine is 53, so these elements are in the correct order in the modern periodic table.
The ions formed have a full outer electron shell, so are very stable. See the study guide on groups in the periodic table for more information.
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