Which of the following statements are true?$\\$ A. Unlike Ga that has a very high melting point, Cs has a very low melting point.$\\$ B. On Pauling scale, the electronegativity values of N and Cl are not the same.$\\$ C. $Ar, K^+ , Cl^– , Ca^{2+}, and S^{2–}$ are all isoelectronic species.$\\$ D. The correct order of the first ionization enthalpies of Na, Mg, Al, and Si is Si >Al > Mg > Na. $\\$ E. The atomic radius of Cs is greater than that of Li and Rb.$\\$ Choose the correct answer the options given below :