11. The hapticity describes the number of carbon monoxide ligands, which are directly bonded to the central atom . 12. By adding electronegative substituents and changing the hybridisation of the central atoms , bond lengths can be manipulated. 13. There is reason to believe that this central atom is an amine which functions as a Lewis base. 14. Bond lengths and charge densities are shown as functions of how many hydride ligands are on the central atoms . 15. With the same central atom X, acid strength increases as the number of oxygens attached to X increases. 16. If the central atom X is strongly electronegative, then it strongly attracts the electrons of the oxygen atom. 17. When the surrounding ligands are much smaller than the central atom , even higher coordination numbers may be possible. 18. The three atoms bond at 90?angles on one side of the central atom , producing the T shape. 19. The latter are stabilized by more fluorine atoms and lighter central atoms , so sulfur hexafluoride is especially inert. 20. Rather, the electronegativity of the central atom ( X ) and the number of O atoms determine oxoacid acidity.
