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.

Explanation

(a) The electronic configuration of element 'X' is 2, 8, 6. It has six electrons in the valence shell.
(b) Valency of the element 'X' is 2. Its molecular formula when it reacts with hydrogen is `XH_(2). [H.X.H].`
(c) The element X is sulphur (S). It is non-metallic in nature.