Question

the diagram shows some subatomic particles.
quarks
which of these statements best identifies the particle that is labeled with an x?

• it is either a neutron or an electron
• it is either an electron or a nucleus
• it is either a nucleus or a proton
• it is either a proton or a neutron

Explanation:

Analyze the diagram structure

The diagram shows a larger composite particle labeled with an arrow pointing to its outer boundary, marked as \(X\). Inside this composite particle, there are three smaller constituent circles connected together, with one labeled as a "Quark".

Identify the composite particle

Protons and neutrons are baryons, which are composite subatomic particles made up of three quarks bound together by the strong force. Electrons are elementary particles (leptons) and do not contain quarks. A nucleus is a collection of protons and neutrons, not a single three-quark system. Therefore, a particle composed of exactly three quarks must be either a proton or a neutron.

Evaluate the given options

The label \(X\) points to the entire composite particle containing the three quarks. Based on the composition, this particle is either a proton or a neutron.

Answer:

• It is either a neutron or an electron
• It is either an electron or a nucleus
• It is either a nucleus or a proton
• It is either a proton or a neutron (Correct answer)