The Learning Company Achieve! Math & Science Grades 1-3 (381933) for PC, Mac "protons neutrons" Questions

...protons, which have a positive electrical charge, and neutrons, which have no charge. All atoms have at least one proton in their core, and the number of protons determines which kind of element an ...

put these from smallest to largest: Crystal, Proton, Molecule, Neutron, electron, Atom electron proton neutron atom molecule crystal