When electrons are added to the outermost shell of a carbon atom, it forms an anion that has a larger radius. an anion that has a smaller radius. a cation that has a larger radius. a cation that has a smaller radius.

When electrons are added to the outermost shell of a carbon atom, it forms an anion that has a larger radius. An anion always has a larger radius than a neutral atom of the same element. This is because more electrons causes greater repulsion between its nucleus and electrons, making the electrons move farther away from the center.