Multiple choice

The successive ionisation energy values for an element 'X' are given below:

(i) 1st ionisation energy = 410 kJ mol-1 (ii) 2nd ionisation energy = 820 kJ mol-1 (iii) 3rd ionisation energy = 1100 kJ mol-1 (iv) 4th ionisation energy = 1500 kJ mol-1 (v) 5th ionisation energy = 3200 kJ mol-1

Find out the number of valence electrons for an atom of 'X'.

  1. 4

  2. 3

  3. 5

  4. 2
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A Correct answer
Explanation

The ionisation energy values for valence electrons are comparable. To remove electrons from inner shell, very high amount of energy is needed. Among the given values, the biggest jump is between IE4 and IE5. Hence, there are four valence electrons for an atom of 'X'.

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