To tell if HF (Hydrogen fluoride) is ionic or covalent (also called molecular) we look at the Periodic Table that and see that H is non-metal and F is a non-metal. When we have a non-metal and a non-metal the compound is usually considered covalent.

For HF there will is a larger difference in electronegativity between the non-metal and non-metal. This difference results in an electron(s) being shared unequally with the non-metal having a higher electronegativity having the electron more of the time..
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Helpful Resources

Metals, Non-Metals on the P- Table: [ Ссылка ]
Ionic, Covalent, & Polar Covalent: [ Ссылка ]
Electronegativity for each element: [ Ссылка ]
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Because we have a combination of a non-metal and non-metal HF (Hydrogen fluoride) is considered an covalent compound.

For more chemistry help, see [ Ссылка ].

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