As long as narcotics are prescribed by a doctor, their use will not lead to addiction.
a. true
b. false

The correct answer is B. False. 

Narcotics have various use in the human body. No matter if the purpose of their use is killing pain, helping the patient to fall asleep easier, or helping the patient battle depression, there is always some danger in using them. Even though they have a different effect from drugs like cocaine and heroine, there are ingredients in many doctor-prescribed narcotics and medications who can lead to some sort of an addiction. In addition, lets not forget that the doctor cannot control how many pills are being taken per day. 

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons

The answer is  d.  hydrogen