Which of the following element is used in photoelectric cell?

1. Metals that have low ionization enthalpies are used in Photoelectric cells.
2. The most popular metal which is used in Photoelectric cells is Cesium (Cs) which has the atomic number 55.
3. Cesium belongs to group 1 (alkali metals) and period 6.
4. The electronic configuration of Cesium is \([\mathrm{Xe}] 6 s^1\).
5. Cesium is used widely in photocells as it can easily convert solar energy into electrical energy.
6. When Cesium is exposed to sunlight it will start emitting electrons which induced the electric flow and generate electricity.
7. Thus, Cesium is the most preferred metal used in photoelectric cells.