The component of an atom that contributes least to its mass is the? by Sunday | Oct 14 | Chemistry JAMB | 0 comments A. proton B. nucleus C. neutron D. electron Correct Answer: Option D – electron Users Also Read These:A person who contributes money to a partnership…If a radioactive atom emits a beta particle, Its…An atom W has 17 electrons and 18 neutrons. Which of…When the nucleus of a uranium atom is split into two…The nucleon number and the proton number of a…