Question

An element X belongs to 3rd period and group 16 in 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

Explanation:

Here is your answer. it may help you.

Answer 2

a) Since the element belong to group 16 its number of valence electrons will be 6.

b) The element X is sulphur and the molecular formula with hydrogen will be H2S. The valency of element X is 2. ( For electron dot structure see the figure)

c) Element X is Sulphur, it is non-metal.

Sorry can't post figure due to network issue.