Which term refers to subatomic particles that compose protons and neutrons?

Which term refers to subatomic particles that compose protons and neutrons?

• A. Isotope
• B. Atom
• C. Ion
• D. Quark

Answer: (D)

Subatomic particles inside protons and neutrons are quarks. Quarks are the fundamental pieces that combine in groups to form protons and neutrons, held together by the strong force. Protons are made of two up quarks and one down quark, while neutrons are made of one up quark and two down quarks. This is why quark is the right term: it names the basic constituents inside these particles, not the larger structures they form. Isotope, atom, and ion refer to different concepts in atomic structure. An isotope is a variant of an element with a different number of neutrons. An atom is the basic unit of matter containing a nucleus and orbiting electrons. An ion is an atom or molecule with a net electric charge due to gained or lost electrons.

Subatomic particles inside protons and neutrons are quarks. Quarks are the fundamental pieces that combine in groups to form protons and neutrons, held together by the strong force. Protons are made of two up quarks and one down quark, while neutrons are made of one up quark and two down quarks. This is why quark is the right term: it names the basic constituents inside these particles, not the larger structures they form.

Isotope, atom, and ion refer to different concepts in atomic structure. An isotope is a variant of an element with a different number of neutrons. An atom is the basic unit of matter containing a nucleus and orbiting electrons. An ion is an atom or molecule with a net electric charge due to gained or lost electrons.