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Question

First four ionization energy values of an element are 191, 578, 872 and 5972 Kcals. The number of valence electrons in the element is

A

4

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B

3

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C

1

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D

2

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Solution

The correct option is B 3
Sudden jump in $I E_{3}$ and $I E_{4}$ show that, it acquires stable configuration after loosing 3 valence electrons, therefore it valency is three.

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