The ionization energies of Li and Na are...

The ionization energies of Li and Na are `520 kJ mol ^-1 and 495 kJ mol ^-1` respectively. The energy required to convert all the atoms present in 7 mg of Li vapours and 23 mg of sodium vapours to their respective gaseous captions respectively are :

52 J, 49.5 J

520 J, 495 J

49.5 J , 52 J

495 J, 520 J

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