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Find the odd one out. (a)Chlorine

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in Physics – Class 12 by (135k points)
Find the odd one out.

(a) Chlorine

(b) Sodium

(c) Oxygen

(d) Helium

This question was posed to me in unit test.

I'd like to ask this question from Experimental Study of Photoelectric Effect topic in portion Dual Nature of Radiation and Matter of Physics – Class 12

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Right choice is (b) Sodium

To explain I would say: In this, sodium is the odd one out because, sodium, being an alkali metal, is photosensitive while the others are not photosensitive materials. Sodium metal emits electrons even when ordinary light falls on it. Therefore, it is known as a photosensitive material.

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