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. (10[1]-5[1])For a given pH, this quantity is found on the x-axis of Frost–Ebsworth (10[2])diagrams. (10[3])Relativistic (10[1])effects (10[1])affecting the 6s (-5[1])orbital (-5[1])allows gold (-5[2])to (-5[1])assume (-5[1])a negative (-5[1])value of this quantity. (10[3]-5[2])Due to the inert-pair effect, (-5[2])larger (-5[1])Group (-5[1])14 elements tend to reduce the value of this quantity (10[1]-5[2])by 2. (10[1]-5[1])Fluorine (-5[1])is the only (10[1]-5[2])halogen (-5[5])to (10[1])exclusively (-5[1])have a value of negative one (10[2]-5[3])for this quantity. (10[7]-5[8])For 10 points, (10[5])name this (10[1])quantity (10[1])that gives (-5[1])the number of electrons (10[1])lost (-5[2])from an (-5[1])atom (10[1]-5[1])during (10[2])bonding. (10[1]0[1])■END■ (10[21]0[34])