Attributes in a table refer to columns, and they describe the properties of the entities in a table. It is incorrect to say that the ordering of attributes in a table is significant. In relational databases, the ordering of columns does not affect the database's functionality. The assertion that an attribute contains values from multiple domains is false; an attribute should contain values from a single domain to maintain consistency and enforce data integrity. The statement that an attribute name can be used only once per table is true because within a given table, each attribute (or column) name must be unique to avoid confusion when referencing data. Therefore, the correct statement is that an attribute name can be used only once per table.