Which of the following sodium halides has the lowest lattice energy?

N a F

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N a C l

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N a B r

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N a I

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Solution

The correct option is D $N a I$
Among sodium halides, the lattice energy is lowest for sodium iodie and highest for sodium fluoride.
Metal halide
$N a F N a C l N a B r N a I$

Lattice energy (kJ/mole)
$910$ $769$ $732$ $682$

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N a F, N a C l, N a B r, N a I

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Metal halide	$N a F N a C l N a B r N a I$
Lattice energy (kJ/mole)	$910$ $769$ $732$ $682$