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 from the options given below:

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 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 from the options given below:

Dr. Abubacker · Accepted Answer

[Solution by Claude - not from source] A false (Ga also melts near 30 °C). B false (N and Cl are both 3.0). C true (all 18 electrons). D false (actual: Si > Mg > Al > Na). E true. So C and E only. Answer (2).

Explanation

Reviewed by Dr. Abubacker

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