Question

What makes cs and k useful as electrodes in photoelectric cells?

Answer 1

✨➡️➡️➡️✝️☘️HOPE HELP YOU⬅️⬅️⬅️^_^^_^✨✝️

⭐⭐⬅️ Answer ➡️➡️➡️➡️

Potassium and Cesium have low ionization energies. So, a low energy photon can also emit an electron from their atoms. 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.

⬅️⬅️☘️

^_^⭐✨

➡️➡️ Please brainliest this answer ⬅️✝️^_^✝️^_^⭐^_^⭐

✨☘️✨☝️

✨

Answer 2

K and Cs has very low ionisation energy due to there large size and less effective nuclear charge. Due to this property, they are used as electrodes in photoelectric cells as they readily emit out electrons on striking of photons of threshold energy.