Consider the elements Mg, Al, S, P and Si, the correct increasing order of their first ionisation enthalpy is:

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Strategy:
 Rank Period 3 elements (Al, Mg, Si, S, P) in increasing order of . Account for both Group 2/13 and Group 15/16 anomalies.

Step 1: Analyze each pair
-  vs :  (Group 13 vs Group 2 anomaly).
-  vs :  (Group 2 vs Group 14).
-  vs :  (Group 14 vs Group 16).
-  vs :  (Group 16 vs Group 15 anomaly).

Step 2: Combine
.

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