Which is more ionic?
$N a F, N a C l, N a B r, N a I$

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Solution

The decreasing order of ionic character $N a F > N a C l > N a B r > N a I$ .
Because among the halogens the electronegativity is more for Fluorine followed by Chlorine, Bromine, Dodine. According to Fajan's rule, the size should be small to have more ionic character. Thus $N a F$ is more ionic.

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