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Q.

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