Charge is always conserved under all interactions. The law is never broken. Also for real particles charge is always integer.

Baryon number is always conserved under all interactions.

Do not forget mesons have baryon number of 0.

If a quark changes flavour it still has baryon number of \( \frac{1}{3} \).

For strong interaction strangeness is conserved. In fact, all flavours of quark are conserved separately under the strong interaction.

Pair production happens if the strong interaction allows the creation of a strange quark then an anti-strange quark must also be produced.

Under the weak interaction strange particles can decay with a change in strangeness of \( \pm1 \).

There are four lepton numbers which are separately conserved in nearly all circumstances.

Leptons all have lepton number 1 and anti-leptons nad lepton number -1.

But each family of leptons has their own lepton number which is conserved.

\( L_e \) is 1 for the electron and electron neutrino.

Similarly, \( L_\mu \) is 1 for the muon and muon neutrino.

And finally, \( L_\tau \) is 1 for the tau and tau neutrino.

The only know situation when lepton number isnt conserved occurs when neutrinos oscillate and change flavour. This is rare and is very hard to observe. But it has happened.