As Chemistry 7404 Data Sheet
Ionisation energies (1st, 2nd, 3rd and 4th) of selected elements, in kJmol–1 Proton number First Second Third Fourth H 1 1310 – – – He – – Li – Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Br Rb Sr Ag – I Cs – Ba – 5 Cambridge Pre-U Revised Syllabus 3 Bond Energies 3(a) Bond energies in diatomic molecules (these are exact values) Homonuclear Heteronuclear Bond Energy / kJmol–1 Bond Energy / kJmol–1 HH 436 HF 562 DD 442 HCl 431 N≡N 944 HBr 366 O=O 496 HI 299 P≡P 485 C≡O 1077 S=S 425 FF 158 ClCl 242 BrBr 193 II 151
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