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basic:attribute,
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periodic:property,
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atomic:property,
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electronic:property,
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electrical:property,
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physical:property,
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related:property,
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isolated:property,
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internal:energy,
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molecular:property,
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key:quantity,
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several:property,
Category Nuances for ionization_energy:
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atomic,
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electronic,
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basic,
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internal,
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periodic,
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several,
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isolated,
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electrical,
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related,
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physical,
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molecular,
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key,
Simple Categories for ionization_energy: