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Electronic Configuration of Actinides

The first fiv...

Question

The first five ionization energies of an element are 9.1, 16.2, 24.5, 35 and 205.7 eV respectively. The number of valence electrons in the atom is

A

2

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B

3

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C

4

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D

5

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Solution

The correct option is C 4
As there is a large IE difference between $I E_{4}$ & $I E_{5}$ i.e. $I E_{5}$ value is extremely high comparatively. It is difficult to remove $5^{t h}$ electron from atom. So, it must have been in the penultimate shell. As a result, it has 4 valence electrons in the outermost shell. After the removal of 4 electrons the element attains noble gas configuration.

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