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The answer to each of the following questions is a single digit integer, ranging from 0 to 9.

The successive ionisation energy values for an element \( X \) are given below:
\( I E_{1}=410 \mathrm{~kJ} \mathrm{~mol}^{-1} ; I E_{2}=820 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
\( I E_{3}=1100 \mathrm{~kJ} \mathrm{~mol}^{-1} ; I E_{4}=1500 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
\( I E_{5}=3200 \mathrm{~kJ} \mathrm{~mol}^{-1} \)
The number of valence electrons for the atom \( X \) is:
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