Chemistry 101

T: Mummy, what is this?
Me: A bottle for you to blow bubbles from

T: What is inside the bottle?
Me: Soap water

T: What is inside the soap water?
Me: Soap

T: What is inside the soap?
Me: Errr...alkali

T: What is inside the al-ka-li?
Me: Errr...chemicals

T: What is inside the chemicals?
Me: Molecules

T: (pondering) Moll-lee-qs. What is inside the molecules?
Me: Errr...nuclei and electrons

T: (pondering for a longer time) What is that mummy?
Me: Tiny things inside the molecules

T: Tiny things? What to they do?
Me: Errrrr i dunno...how about we blow some bubbles?

T: *Happily* OK! (All talk of molecules and what nots forgotten completely)
Me: (thinking) What do they do? What do they do? *Panic* Dun test my chemistry knowledge so soon alright??

Oh my god, and im embarassed to say im a chemistry teacher!! But how do you explain what do nuclei and electrons do to a 3 year old??