Sodium chloride easily dissolves in water. This is because

Ionic bonds are usually formed by the combination of elements with:

Which of the following compounds has the lowest melting point?

The lattice energy of the lithium halides is in the following order:

The principal reason that the melting point of $NaF$ is much higher than that of $RbBr$ is that

The ionic bonds $X^{+}Y^{-}$ are formed when
$I$. electron affinity of $Y$ is high
$II$. ionization energy of $X$ is low
$III$. lattice energy of $XY$ is high
$IV$. lattice energy of $XY$ is low
Choose the correct code.