Considering the electronic configuration of cesium, it will form +1 ion charged state.
Explanation:
The atomic number of Caesium is 55
Its electronic configuration is given by
[tex]1s^2\ 2s^22p^6\ 3s^23p^63d^{10}\ 4s^24p^6\ 4d^{10}\ 5s^25p^66s^1[/tex]
The final shell contains 1 electron and it will be easier for cesium atom to lose this electron in order to attain stable configuration.
After losing 1 electron, it attains a charge of +1.
