S Block Elements Question 250

Question: Photoelectric effect is maximum in

[AFMC 2004]

Options:

A) $ Cs $

B) Na

C) K

D) Li

Show Answer

Answer:

Correct Answer: A

Solution:

Group I element are so highly electropositive that they emit electrons even when exposed to light (Photoelectric effect) and this character increase on moving down the group from lithium towards cesium.

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