【正确答案】30 (5 from the top boron atom,5 around the upper pentagon, 10 from the upper pentagon to the lower,5 around the lower pentagon,and 5 to the bottom boron atom)
【答案解析】
【正确答案】12×3=36
【答案解析】
【正确答案】Since there are not 60 electrons,each edge line cannot represent an electron pair
【答案解析】
【正确答案】There must be some three-center "bridge bonding" ,just as there is in diborane.