Can someone explain conserved quantities in this activity

[Onixviper316]

Hello,
Can Someone help me with this activity - http://www.particleadventure.org/other/education/five_s.html - its activity 5 The rules of the Game
The answer to the activity is - http://www.particleadventure.org/other/education/five_s.html
I don't understand how they got the answer for question 2 in this activity, can someone explain this to me please.
Thank You

 

[mfb]

Your link to the answer page is the same as the other link.

The basic concept to find those quantities: For each observed event, list the sum of charges, number of baryons and so on at both sides (before and after the reaction). If one of those numbers differ in any allowed reaction, the quantity is not conserved. If they are always the same, it might be a conservation rule (you cannot prove conservation rules, just see that you cannot find a violation).

The unobserved events can give you a hint which properties might be interesting to look at, especially if both sides are very similar.

 

[Onixviper316]

oh wow didn't realize i put in the wrong link...srry about that and thank you for the help
but this is the answer page - http://particleadventure.org/other/education/teacher_only/five_onlyt.html
could u explain with one of the observed and unobserved events like as an example
Thank You

 

[Onixviper316]

also as the answers are baryon number, electric charge and lepton number
in the question it says that all three quantities should be in all the observed events while at least one is missing from all the unobserved events
I can kinda find the missing ones in the unobserved events but the observed events some of them don't have any leptons to begin with, then how can they have lepton number?

 

[naima]

In this case the lepton number is 0. (the lepton number of a baryon is 0)

 

[Onixviper316]

i think i get it now
thanks for all the help guys :D