Three nitrogen groups are bound to this element in alternative coupling agents used in solid-phase peptide synthesis, such as B·O·P and Py·B·O·P. A method of activating a (15[1])palladium zero catalyst for the Heck reaction involves acetate forming a bond with this element. Nickel complexes to (15[1])ligands containing this element were used to develop the Tolman (15[1])cone angle (-5[1])parameter. Berry (*) pseudo-rotation is classically exemplified by this element (15[1])bound to five fluorine atoms. Many courses incorrectly teach that oxygen binds to this element in (10[1])a (10[1])betaine (“beta-een”) intermediate [emphasize] after a carbon-carbon bond forms in the Wittig reaction. For 10 (10[1])points, name this (10[1])element (10[2])that sits right (10[1])below nitrogen on the periodic (10[1])table. ■END■ (10[1])