The first ionization potential of Na, Mg and Si are 496, 737 and 786 kJ mol⁻¹ respectively. The ionization potential of Al will be closer to
(a) 760 kJ mol⁻¹
(b) 575 kJ mol⁻¹
(c) 801 kJ mol⁻¹
(d) 419 kJ mol⁻¹