The diagram below is an artist’s impression of a single atom of element Be. The neutrons are shown with stripes, the protons are gray, and the electrons are black. These particles are not drawn to scale. Two concentric circles are shown. Inside the inner circle are nine smaller circles in a 3 by 3 matrix; the corner small circles and the one in the center of the array are striped, with the rest of the small circles solid gray. Between the two outer circles two black dots are directly opposite each other. Which element below could be an isotope of this atom? sodium-10 beryllium-10 boron-9 carbon-9