1. Slide 1:Title.Intoroduce the session,andyourselfif necessary.
Slide 2:Quarks. Explainthe conceptof quarksas the smallestthingwe have found.The conceptof
fundamental particlesasindivisible.Matterandantimatter.Askwhattheynotice aboutdownand
strange (theyhave the same charge – explainthatitismass thatmakesthemdifferent).

2. Slide 3:Generations.
Downand strange have the same charge but differentmasses –strange islike anoldersiblingof down.
Discussthe otherthree quarks(charm,bottomand top) – these are not normallyexaminable,butthey
followthe same patternasup anddown:we have three generations.Thispatternisrepeatedinthe
leptonfamily.Discussleptonsasthe secondtype of fundamental particle.

3. Slide 4:Particle Types.Explainthata hadronisa particle made outof quarks.Quarks don’tlike tobe on
theirown(we will findoutwhylater),sotendtosticktogether.The mostcommonhadronsare protons
and neutrons,made of upand downquarks.Askthe studentstotry to work outhow to make a proton,
whichhas a charge of +1. If necessary,give themthe hintthatthere are three quarksina proton.(They
needtowork outthe combinationof three chargeswhichaddsto1). Do the same for neutrons,once
theyhave workedthisout