Examine the following set of ionization energy values for a certain element. How many valence electrons does an atom of the neutral element possess?

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Answer: The number of valence electrons depends on which column it is in. The first FULL column has 1 The second FULL column has 2. The you get to the transitions metals which is like a rectangle but with half the height as some other columns. They can have about 2-4. The third column has 3 then 4, 5, 6, 7, and finally the last column has 8