The successive ionisation energy values for an element ' 
' are given below:
(i) 
ionisation energy 
(ii) 
ionisation energy 
(iii) 3rd ionisation energy 
(iv) 4th ionisation energy 
(v) 5 th ionisation energy 
The number of valence electron in ' 
' will be
Text Solution
Verified by ExpertsB
Removal of the 5th electron requires almost more than double the energy required to remove the 4th electron. This implies that the first four electrons are removed from the valence shell after that element acquires stable E.C. Hence, number of valence electrons in the atom ' 
' will be four.
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