Justify the placement of '0, S', Se, Te and 'Po' in the same group of the periodic table in terms of electronic configuration, oxidation state and hydride formation.

Explanation

i. They haye same general electronic configuration .ns^2 np^4..
ii. They show .+2,+4,+6,-2. oxidation states except oxygen which.cannót show higher positive oxidation states.
Therefore, they have been put in the same group.
iii. All these elements of Group 16 form hydrides of the type .H_2 EE=O, S Se, Te, Po, All.
these hydrides except .H, O. possess reducing properties. Except .H_2 O., all the hydrides are acidic in nature. These hydrides except water are thermally not stable,