The pair in which the first compound is ionic and the second compound is covalent,is

Provide the steps and their corresponding enthalpies for the formation of $NaCl$ (sodium chloride).

Which of the following substances is the most ionic?

What is the nature of chemical bonding between $Cs$ and $F$?

In which of the following species are the bonds non-directional?

Use the following data to calculate $\Delta _{lattice}H^{\theta }$ for $NaBr$. $\Delta _{sub}H^{\theta }$ for sodium metal $= 108.4 \ kJ \ mol^{-1}$,ionization enthalpy of sodium $= 496 \ kJ \ mol^{-1}$,electron gain enthalpy of bromine $= -325 \ kJ \ mol^{-1}$,bond dissociation enthalpy of bromine $= 192 \ kJ \ mol^{-1}$,$\Delta _{f}H^{\theta }$ for $NaBr_{(s)}$ $= -360.1 \ kJ \ mol^{-1}$.