(a) Given: Element belongs to 3rd period and group 16.
Since it belongs to period 3, therefore, it has 3 energy shells and as the group number is 16, means that it have 6 electrons present in valence shell.
The electronic configuration will be: 2, 8, 6
The valency of element is 2 as it needs only 2 more electrons to attain stable gas configuration.
(b) Molecular formula of the compound when it reacts with hydrogen can be calculated by cross multiplication of valencies:
Therefore, the compound will be H2X. The electron dot structure of the compound is as follows:
(c) The name of the element is Sulphur and is non-metallic.
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