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Q.

For an element (X) the successive ionisation energies, IE₁, IE₂, IE₃, IE₄, IE and IE₅ are 800, 2427, 3658, 25024 and 32824 kJ mol respectively, then what is the number of valence electrons present in the element?

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a

2

b

3

c

4

d

5

answer is B.

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Detailed Solution

First three IE are small. as compared to IE₄ and IE₅ . So three electrons can be easily lost.

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For an element (X) the successive ionisation energies, IE1, IE2, IE3 , IE4, IE and IE5 are 800, 2427, 3658, 25024 and 32824 kJ mol respectively, then what is the number of valence electrons present in the element?