# Why don't hadrons form from quarks of all the same charge?

Why don't Hadrons ever form from quarks of all the same charge? For instance you never see 2 or 3 up quarks together with no down quarks or vice-versa.

They do form, but don’t last long. Delta baryons can have three up quarks (for the $$\Delta^{++}$$) or three down quarks (for the $$\Delta^-$$). These baryons are unstable and last only a few trillionths of a trillionth of a second.
• Planck units are the natural units for theories of relativistic quantum gravity, formed by setting $c$, $\hbar$, and $G$ to $1$. – G. Smith Nov 11 at 1:23