Total number of element(s) which have only single oxidation state (other than zero) in their corresponding stable compounds among the following:

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Strategy:
 Elements with single oxidation states include alkali metals (), alkaline earth metals (), Al (), Zn (), and Fluorine ().

Step 1: Analyze each element
- : Strictly show  (alkali) or  (alkaline earth/Zn). (5 elements)
- : Strictly shows . (1 element)
- : Strictly shows . (1 element)
- : Shows  and  (Inert pair effect).
- : Shows  and .

Total: .

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