Which of the following is incorrect for ionic compounds?

An ionizing solvent has

The element which readily forms an ionic bond has the electronic configuration

In the crystals of which of the following ionic compounds would you expect maximum distance between the centres of cations and anions?

If the enthalpy of sublimation of $Li$ is $155 \ kJ \ mol^{-1}$,enthalpy of dissociation of $F_2$ is $150 \ kJ \ mol^{-1}$,ionization enthalpy of $Li$ is $520 \ kJ \ mol^{-1}$,electron gain enthalpy of $F$ is $-313 \ kJ \ mol^{-1}$,and standard enthalpy of formation of $LiF$ is $-594 \ kJ \ mol^{-1}$,then the magnitude of the lattice enthalpy of $LiF$ is . . . . . . $kJ \ mol^{-1}$ (nearest integer).

Which of the following has the strongest bond?