The statement that is true for the long form of the periodic table is

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Strategy:
 The "Long Form" of the periodic table is the modern arrangement based on atomic numbers. Its primary utility lies in summarizing trends and relationships between the electronic structure and property of elements.

Step 1: Evaluate the options
- (a): While it reflects subshell filling (), this is a structural detail rather than the overarching "truth" or purpose of the table.
- (b): The table helps predict valency, but stable oxidation states for many d and f-block elements are complex

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