Ionization enthalpy and electron gain enthalpy

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, \(\mathrm{K^+}\), \(\mathrm{Cl^-}\), \(\mathrm{Ca^{2+}}\), and \(\mathrm{S^{2-}}\) 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 :

Arrange the following elements in increasing order of first ionization enthalpy:

Li, Be, B, C, N

Choose the correct answer from the options given below:

For the second period elements the correct increasing order of first ionisation enthalpy is :

In which of the following options the order of arrangement does not agree with the variation of property indicated against it ?