What is a quark?

A quark is a type of elementary particle that is a fundamental constituent of matter. 

Quarks combine together to form baryons and mesons.

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What is the relative charge of the up quark?

+23+\frac{2}{3}

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What is the relative charge of the down quark?

−13-\frac{1}{3}

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What is the relative charge of the strange quark?

−13-\frac{1}{3}

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What is the quark composition of a proton?

uud


2 up quarks and 1 down quark

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What is the quark composition of a neutron?

udd


1 up quark and 2 down quarks

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What is the quark composition of a π+ meson?

ud‾\text{u}\overline{d}


1 up quark and 1 anti down quark

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What is the baryon number of a quark?

+13+\frac{1}{3}


A baryon has a baryon number of +1, so 3 quarks are required.

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What is the quark composition of the antiproton?

u‾ u‾ d‾ \overline{\text{u}}\ \overline{\text{u}}\ \overline{\text{d}}\ 


2 anti-up quarks and 1 anti-down quark

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What is the strangeness of a proton?

Zero because it does not contain a strange quark.

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