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. $Ar,K^{+},C{l}^{-},C{a}^{2+}$, 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 from the options given below:

1. Statement A is false because Ga has a very low melting point (approx $30^{\circ }\text{C}$), though it has a high boiling point.2. Statement B: On Pauling scale, N and Cl both have values of approximately $3.0$, so saying they are "not the same" is technically incorrect in most standard textbooks.3. Statement C: All species have $18$ electrons. This is true.4. Statement D: Correct order is Si ($786$) > Mg ($737$) > Al ($577$) > Na ($496$). Thus Si > Mg > Al > Na. The statement given is false.5. Statement E: Atomic radius increases down the group. Cs is below Li and Rb. This is true.6. Based on standard options, C and E are definitely correct.