The first ionization enthalpy of \( \mathrm{Na} \). \( \mathrm{Mg} \) and \( \mathrm{Si} \), res...
The first ionization enthalpy of \( \mathrm{Na} \). \( \mathrm{Mg} \) and \( \mathrm{Si} \), respectively, are: 496, 737 and \( 786 \mathrm{~kJ} \mathrm{~mol}^{-1} \). The first ionization enthalpy \( \left(\mathrm{kJ} \mathrm{mol}^{-1}\right) \) of \( \mathrm{Al} \) is
(a) 487
(b) 768
(c) 577
(d) 856
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