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An element 'X' belongs to 3^(rd) period ...

An element 'X' belongs to `3^(rd)` period and group 16 of the Modern, Periodic Table.
(a) Determine the number of valence electrons and the valency of 'X'.
(b) Molecular formula of the compound when 'X' reacts with hydrogen and write its electron dot structure.
(c) Name the element 'X' and state whether it is metallic or non-metallic.

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