10. An example of an atom that has no charge is one that has
A. 2 protons, 2 electrons, and 1 neutron.
B. 3 protons, 1 electron, and 3 neutrons.
C. 1 proton, 2 electrons, and 3 neutrons.
D. 3 protons, 2 electrons, and 1 neutron.