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Q.

The successive ionisation energy values for an element X are given below
A. 1^st ionisation energy = 410 kJ mol^-1
B. 2^nd ionisation enerry = 820 W mol^-1
C. 3^rd ionisation energy = 1100 kl mol^-1
D. 4^th ionisation energy = 1500 kJ mol^-1
E. 5^th ionisation energy = 3200 kJ mol^-1
Find out the number of valence electron for the atom, X

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Detailed Solution

The ionisation energies provide an indication about the number of valence electrons in an atom.
For example, Na has lE₂ >> lE₁ because it has one valence electron, while Mg has IE₃ >> lE₂ > lE₁,
because it has two valence electrons'
In this case X has lE₅ >> lE₄ > lE₃ > lE₂ > lE₁
Therefore it has four valence electrons.

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