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Question
Which one of the following metals does not exhibit emission of electrons from its surface when irradiated by visible light?
Options
Rubidium
Sodium
Cadmium
Caesium
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Solution
Cadmium
Explanation:
Alkali metals belong to Group 1 elements. This group of elements includes lithium, sodium, potassium, rubidium, cesium, and francium.
Due to their high reactivity, alkali metals exhibit photoelectric emission when exposed to visible light, although cadmium is not one of these alkali metals.
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