The first ionization enthalpy (∆i H ) values of the third-period elements, Na, Mg, and Si are respectively 496, 737, and 786 kJ mol–1. The first ∆i H value for Al will be-
1. Less than 496 kJ mol–1
2. Less than 737 kJ mol–1
3. In between 737 kJ mol–1 and 786 kJ mol-1
4. Cannot predict
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