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The successive ionzation enegry values f...

The successive ionzation enegry values for an element `X` are given below:
(i) `1st` ionization enegry `= 410 kJ mol^(-1)`
(ii) `2nd` ionization energy `= 820 kJ mol^(-1)`
(iii) `3rd` ionization enegry `= 1100 kJ mol^(-1)`
(iv) `4th` ionization enegry `= 1500 kJ mol^(-1)`
(v) `5th` ionization enegry `= 3200 kJ mol^(-1)`
Find out the number of valence electrons for the atom `X`.

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