Examine the following set of ionization energy values for a certain element. How many valence electrons does an atom of the neutral element possess? Ionization step                       Ionization Energy (kJ/mol) Ei1                                           1012 Ei2                                              1903 Ei3                                           2912 Ei4                                           4956 Ei5                                           6273 Ei6                                           22233 Ei7                                           25997 Enter the answer numerically as an integer.

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