The Na+ and F- and Cl- and K+ both can form ionic compound.
What is ionic compound ?
The ionic compound is the compound formed by the ions which is held together by ionic bond.
What is ionic bond ?
The bond formed by the oppositely charged ions through electrostatic force of attraction is called ionic bond.
The complete transfer of valence electron is takes place .
The ions should be oppositely charge .
The electronegativity difference between ions should be high.
So, there are two options in the question is correct.
Na+ and F-
Cl- and K+
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