The parts of the atom that are labeled in the diagram are as follows:
- Label A - the nucleus
- Label B - the electron shell
The nucleus of an atom usually contains the proton and the neutron while the electrons are found outside the nucleus within the electron shells.
Looking at the diagram, the red and blue balls represent the proton and the neutron respectively while the small ash balls represent the electrons. Hence, A must be the nucleus while B is the shell.
More on the atom can be found here: https://brainly.com/question/14214017
