Question

An element 'X' belongs to period "3" 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.

Answer 1

since the element belongs to 3rd period and group 16, the atomic number of the element is 16.

X = 2, 8, 6

(a) Valence electrons are 6
Valency = 2

(b) Formula = $H_{2}X$


(c) X is sulphur, it is a non-metal.