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Na, Mg and Si have first ionization enthalpies 496, 737 and 786 kJ/mol. Al's value is closest to what?
A760 kJ/mol
B575 kJ/mol
C450 kJ/mol
D800 kJ/mol
Answer & Solution
Correct answer: B. 575 kJ/mol
Al loses a 3p electron shielded by the 3s pair, so its value falls below Mg, close to 575 kJ/mol.
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