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I was wondering if when we were classifying trends, would we typically always prioritize the vertical direction over the horizontal direction? My logic is that an additional shell plays more of a role in the trends of a periodic table than differing nuclear charges.
From my understanding, vertically is prioritized because of the additional shells in the cases of atomic radius and ionization energy, but electron affinity has more to do with filling the shells than periodicity.
Vertical gives more information, and going up or down loses and gains an entire shell, respectively. This extra chunk of space that the atom now takes up do to the extra shell would much more definitively tell us what will happen rather than a one or two valence electron change.
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