Ionization Enthalpy — Prelims Questions

Which of the following elements has the highest first ionization enthalpy ($IE_1$)? (A) Lithium (Li) (B) Boron (B) (C) Beryllium (Be) (D) Carbon (C)

Which of the following statements regarding ionization enthalpy is INCORRECT? (A) Ionization enthalpy generally decreases down a group. (B) The second ionization enthalpy ($IE_2$) is always greater than the first ionization enthalpy ($IE_1$). (C) Elements with stable half-filled or fully-filled subshells have lower ionization enthalpies. (D) Ionization enthalpy is an endothermic process.

An element has successive ionization enthalpies (in kJ/mol) as follows: $IE_1 = 738$, $IE_2 = 1451$, $IE_3 = 7733$. To which group of the periodic table does this element most likely belong?

Arrange the following elements in increasing order of their first ionization enthalpy: F, O, N, C.

Which of the following factors does NOT influence the magnitude of ionization enthalpy? (A) Nuclear charge (B) Atomic radius (C) Number of neutrons (D) Electronic configuration

Which of the following elements would have the lowest first ionization enthalpy ($IE_1$)? (A) Cs (Cesium) (B) K (Potassium) (C) Na (Sodium) (D) Li (Lithium)