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The only probable good thing I can think of is :

CaF2, calcium fluoride, existing of one Ca2+ ion and two F- ions.

[If you meant something else I would like trying to answer that, if you could clarify your Q. more precisely. Please use capitals when appropriate. I don't know what 'ca2f-' is.

You can mail me at my message board.]

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14y ago

What else can I help you with?