Periodic Trends in Properties of Elements

2025 1 question

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