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Periodic Trends:- First ionisation energy. The first ionisation energy for lithium is the energy that has to be supplied for remove one mole of electrons from one mole of lithium atoms in the gas state ie it is D H for Li(g) Li + (g) + e-. 2500. 2250. First ionisation energy
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Periodic Trends:- First ionisation energy. The first ionisation energy for lithium is the energy that has to be supplied for remove one mole of electrons from one mole of lithium atoms in the gas state ie it is DH for Li(g) Li+(g) + e- 2500 2250 First ionisation energy (kJ mol-1) 2000 1750 1500 1250 1000 750 500 250 H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Element