Ionization potential decreses ftom Li to Cs?

Ionization potential decreases from Li to Cs.

Ionization is the process to remove one electron from the outermost shell of a gaseous atom to form a gaseous singly-charged cation, i.e.
M(g) → M⁺(g) + e⁻

Down Group 1 from Li and Cs, the atomic size increases and thus the distance between the positive nucleus and the outermost shell. In other words, the electron in the outermost shell experiences a decreasing nuclear attraction and this electron needs decreasing energy to remove it when going down Group I from Li to Cs. This results in decreasing ionization potential from Li to Cs.

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