Question

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 C 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 from the options given below:

• A. C and E only
• B. C and D only
• C. A, C, and E only
• D. A, B, and E only

Hint:

Isoelectronic species have the same number of electrons, but not necessarily the same number of protons. Always check the electron configurations and atomic sizes carefully when analyzing such questions.