SCIENCE ATOM BUILDER ACTIVITY CAN WE THE STUFF BURNT TOAST ATOMS CARBON ATOM SUBATOMIC PARTICLE IDENTIFIED TEN YEARS LATER ERNEST RUTHERFORD DISCOVERED DENSE JAMES CHADWICK PARTICLE SCIENTISTS THOUGHT ATOMIC BUILDING BLOCKS CHANGED MURRAY QUARK BELIEVED PROTON NEUTRON MADE UP SMALLER PARTICLES PHYSICISTS LEARNED THE PAST NUMBER SUBATOMIC PARTICLES NUCLEUS ELECTRONS ELECTROMAGNETIC FORCE CHARGES PROTONS NEGATIVE NEUTRONS NO CHARGE CHANCE FOR YOU CONSTRUCT START HYDROGEN ATOM ONE ELECTRON BY THE WAY MUST BUILD QUARKS UP QUARKS DOWN QUARKS KEEP NEVER IF YOU WANT TO REFER TO THE ATOM GUIDE ELEMENTARY PARTICLES BUILDING STABLE ATOM GLOSSARY ARE YOU DESCRIPTION RELATED PEOPLE DISCOVERIES NIELS BOHR WERNER HEISENBERG MAX PLANCK ERWIN STEVEN WEINBERG PLANCK DISCOVERS QUANTUM NATURE ENERGY RUTHERFORD BOHR DESCRIBE ATOMIC STRUCTURE THE UNCERTAINTY PRINCIPLE CHADWICK DISCLAIMER TROUBLE PRINTABLE VERSION HELP WGBH PBS ONLINE SEARCH FEEDBACK SHOP