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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.

Asked by Deebu 7th March 2015, 9:52 AM
Answered by Expert

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.

Answered by Expert 9th March 2015, 5:32 PM
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