Why do cs and k used as electrodes in photelectric cell?
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Thus, they are used in photoelectric cells. Sodium and lithium have larger ionization energies as they are smaller in size and have higher effective nuclear charge. So, removing an electron from them requires higher energy and hence they are not used in photoelectric cells
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Since Cs and K is the electropositive element of all so it has the minimum ionization energy and so contains the maximum capacity to lose electrons. This is why Cesium and potassium are used in photoelectric cells.
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