Lowest oxidation number of an atom in a compound AB is . The number of electrons in its valence shell is .

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Strategy:
 Identify the element based on its minimum oxidation state. The lowest oxidation state of a non-metal is typically related to the number of electrons it needs to complete its octet (Group number ).

Step 1: Determine the group
In the compound , if the lowest oxidation number of  is , it implies  needs 2 electrons to complete its octet.
This characteristic is typical for elements in Group 16 (e.g., Oxygen, Sulfur).

Step 2: Count valence electrons
Group 16 elements have a general valenc

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