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Sort[ElementData[EntityClass["Element", "Radioactive"], "Name"]] == 
 Sort[EntityValue[EntityClass["Element", "Radioactive"], "Name"]]

gives True

However, EntityValue gives more complete information when querying "Density"

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Is it a bug in ElementData? Does EntityValue design to give more complete data than *Data function? So are we encouraged to use EntityValue instead of using *Data?

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