Which of the following molecules has a trigonal planar shape?

Well to my expert knowledge and my exquisite calculations i think the the negative ion # 412 is the key to sucess

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.