Question

What is the 1st ionization energy of cesium?

A) Approximately 375.7 kJ/mol
B) Around 500.2 kJ/mol
C) Approximately 250.3 kJ/mol
D) Around 600.5 kJ/mol

Answer 1

The first ionization energy of cesium is approximately 375.7 kJ/mol, which is the energy required to remove its outermost electron and form a cation.

Step-by-step explanation:

The first ionization energy of cesium is approximately 375.7 kJ/mol. Ionization energy is the energy required to remove an electron from a gaseous atom, with the first ionization energy specifically referring to the removal of the first valence electron. The given value corresponds to the ionization process depicted by the reaction Cs(g) → Cs+(g) + e−, where an energy of 375.7 kJ/mol is needed for cesium to lose its outermost electron and form a cation.