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Atomic Radius, Electronegativity, Electron Affinity, Ionization Energy -…
Atomic Radius
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Increases down the group
More energy levels/shells are added, increasing the distance between the nucleus and valence electrons.
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Electronegativity
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Decreases down the group
The distance between the nucleus and valence electrons increases, decreasing the attractive force, and the shielding effect increases, reducing the effective nuclear charge.
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Ionization Energy
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Decreases down the group
The valence electrons are farther from the nucleus, and experience less attraction, so it requires less energy to remove them.