Question

The diagram below shows some subatomic particles.

A diagram similar to a flowchart starts with a circle labeled Atom. From there, a line leads to a small circle labeled Electron and a larger one labeled Nucleus. From nucleus, two lines lead to a group of circles, labeled Neutrons and protons. From there, two lines lead to a circle surrounding two blue and one orange smaller circles. One of the blue circles is labeled with a question mark.

What is the particle that is labeled with a question mark (?) in the diagram?
beta particle
quark
isotope
alpha particle

Answer 1

quark

Explanation: the diagram shows protons/neutrons made of three smaller particles. Those small circles are quarks (e.g. a proton = two up quarks + one down quark). Alpha/beta particles and isotopes are different concepts.