- Atomic radius
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Distance form the nucleus to the farthest occupied energy level.
- effective nuclear charge
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The net positive charge experienced by an electron in a multi-electron atom.
- ionic radius
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Distance from the nucleus to the farthest occupied energy level of the most commonly formed ion.
- Ionization energy
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Amount of energy required to remove the most loosely held electron.
- period
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A horizontal row on the periodic table.