11. A specific way to make 1, 2-dimethyldiborane is to react methyldiborane with a sufficient amount of a Lewis base . 12. To test the notion of polarizability involvement in the strength of halogen bonding, bromopentafluorbenzene was used as a Lewis base . 13. When a pyridine ligand is part of a metal complex, it can be easily replaced by a stronger Lewis base . 14. Later, the Army reallocated 3, 353 acres ( 13.6 km?) of their land to expand the Fort Lewis base . 15. When a Lewis acid and Lewis base cannot combine due to steric hindrance, they are said to form a frustrated Lewis pair. 16. The H " strength of a hydride also known as its hydride donor ability or hydricity corresponds to the hydride's Lewis base strength. 17. In addition, the Lewis base ( XB acceptor ) tends to be electronegative as well and anions are better XB acceptors than neutral molecules. 18. Similarly, if a Lewis Base donates an electrons, is it also a reducing agent ? talk ) 20 : 16, 17 April 2009 ( UTC) 19. It can act as a fluoride ion donor or acceptor ( Lewis base or acid ), although it does not dissociate appreciably into and ions. 20. In forming this ion, the phosphite ion is behaving as a Lewis base and donating a pair of electrons to the Lewis acid, H +.