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Question

Arrange the following elements in order of their increasing ionisation energies O,S,Se,Te,Po :

A
Se,Te,S,Po,O
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B
O,S,Se,Te,Po
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C
Po,Te,Se,S,O
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D
Te,O,S,Po,Se
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Solution

The correct option is A Po,Te,Se,S,O
Ionisation energy decreases from top to bottom in a group. So increasing order will be
Po < Te < Se < S < O

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