PLEASE HELP ill also answer questions that you have posted if you answer these correctly (67pts)

Which transition by an electron will release the greatest amount of energy? oa ob oc od

**urgent** roberto plans to use two transformers to reduce a voltage of 120 v to 4 v. he uses a transformer that has 300 coils in the primary winding and 50 coils in the secondary winding. he has four other transformers, as listed in the table. which transformer should roberto use to have an ending voltage of 4 v? a- w b-xc- yd- z

Achlorine atom has 17 protons and 18 neutrons. what is its mass number? what is its atomic number?