Ascientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. what particles is the scientist studying? a. the he neutrons b. the he nucleus c. the he electrons d. the he quarks

Atoms are made up of protons, neutrons and orbiting electrons. Scientific discoveries found out that there are even smaller parts of these sub particles called quarks, anti-quarks and gluons. A proton is made up of three quarks (two up quarks and a down quark). answer is D.