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Question:

An element X belongs to 3rd period and group 16 of the Modern Periodic Table. Write the molecular formula of the compound when 'X' reacts with hydrogen and write its electron dot structure?

Solution:

From the given data we know that X belongs to oxygen family. So, X possesses valency of 2. When X reacts with hydrogen it forms H₂X. Thus, the molecular formula of the compound is H₂X. Electron dot structure can be represented as shown in figure: [Diagram of electron dot structure would be included here. Since I cannot create images, a textual representation is not possible. The diagram would show two hydrogen atoms each sharing a single electron pair with the central X atom, which would have six additional electrons represented as lone pairs.]