Size of ions increase down the group:
Then why is gropu 16 elements: O<S<Se<Te [why is Po excluded]?
Same happense in group 17 [At is excluded]
Please explain why.
The first four elements of group 16 i.e. Oxygen, sulphur, selenium and tellurium are non-metals.
Polonium is the last member of the group 16 and is metallic in nature.It is also radioactive and is only short-lived.
Same goes with Astatine of group 17.
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