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.

Areaction in which products can react to re-form reactants is

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