B = Boron
a Boron atom can have 5 atoms 4 neutrons and 5 electrons down is a picture of what that looks like this website should help you with your assignment https://phet.colorado.edu/sims/html/build-an-atom/latest/build-an-atom_en.html
also you can search the periodic table and for the element search them to see what element is
hope this helps
