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Data Booklet for Chemistry (Advanced Level)
9746 H2 CHEMISTRY 12008) Ionisation encrgies (1st, 2nd, 3rd and 4th) of selectcd elemcnts, in kJ mol-' Proton Number First Sccond Third Fourth H 1310 He 2 2370 5250 Li 3 519 7300 11800 Be 'I 900 1760 14800 21000 13 5 799 2420 3660 25000 C 6 1090 2350 4610 6220
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