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Anomalous Behavior of Lithium Halogens

cesium can be...

Question

Cesium can be used for photoelectric cells not lithium. Why?

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Solution

The ionization potential of cesium is lower than that of lithium.
Hence Cs can lose electron very easily while lithium cannot.
As compared to Cs, Li is smaller in size and therefore, requires high energy to lose an electron.
That's why, cesium can be used for photoelectric cells not lithium.

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