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Would the trend in atomic size cause an increase or a decrease in the attraction between the nucleus and the valence electron within the group as the atomic number increases?
Wiki User
∙ 11y ago
Atomic size increases from top to bottom in a group due to increase in theshieldingeffect.
As you go down the group shielding from core electrons increases (as more core electrons are added), therefore valence electrons experience weaker attraction forces from the nucleus and are located further away from it, resulting in an increase in size.
If you move across a period the attraction between the nucleus and valence electrons increases because the number of protons and the number of valence electrons both go up whereas the number of core electrons stays the same (shielding decreases). In this case the size decreases.
Wiki User
∙ 11y ago
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