he left gaps for yet to be discovered elements he switched the order of a few elements to keep the groups consistent Iodine has a lower relative atomic mass than tellurium. So iodine should be ...
In the periodic table the elements are arranged into: in older periodic tables, group numbers 1-7 and 0 are given for the main groups in newer periodic tables, ‘IUPAC’ group numbers 1-18 are ...
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