sumber : https://phet.colorado.edu/in/simulations/build-an-atom
: https://www.colorado.edu/
sumber : https://phet.colorado.edu/in/simulations/build-an-atom
: https://www.colorado.edu/
sumber : https://phet.colorado.edu/in/simulations/build-an-atom
: https://www.colorado.edu/
sumber : https://phet.colorado.edu/in/simulations/build-an-atom
: https://www.colorado.edu/