Respuesta :
B. Rb is the answer
The correct order of ionization energies is (A) Cs < Rb < K < Na < Li .
What is Ionization energy?
Ionization energy is the minimum energy required to remove the loosest bound electrons from isolated gaseous atoms, cations, or molecules.
Ionization energy is a measure of the ability of an element to undergo a chemical reaction that requires the formation of ions or the loss of electrons. It is also generally related to the type of chemical bond of the compound formed by the element.
Ionization energy is a simple term that can be described as a measure of the difficulty of removing an electron from an atom or ion, or the tendency of an atom or ion to donate an electron. Electron loss usually occurs in the ground state of a species.
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