The incorrect statement is:

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Canvas Classes · Accepted Answer

Strategy:
 Review periodic trends for ionization enthalpy (). Higher  and smaller radius increase . Down a group,  decreases. In transition metals, poor shielding by -electrons can lead to anomalies.

Step 1: Evaluate each statement
- (1)  in : Correct.  increases up Group 1 as size decreases.
- (2)  has lower  than : Correct.  decreases down Group 18.
- (3) : Correct.  () is Group 1,  () is Group 2.  increases across the period.
- (4) : Incorrect. Zinc () has a stable fully filled  configuratio

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