The metals found in Fischer-type and Schrock-type carbenes have low and high values for this quantity respectively. The 18-electron rule is applicable for low values of this quantity for metals in organometallic complexes. For a given pH, this quantity is found on the x-axis of Frost–Ebsworth diagrams. Relativistic effects affecting the 6s (-5[1])orbital allows gold to assume a negative value of this quantity. Due to the inert-pair effect, larger (-5[1])Group 14 elements tend to reduce the value of this quantity (-5[1])by 2. (-5[1])Fluorine is the only halogen to exclusively have a value of negative one for this quantity. (10[1])For 10 points, name this (10[1])quantity that gives the number of electrons lost from an atom during bonding. ■END■ (10[2]0[2])