When building an atom, pay close attention to the particles' electrical charges. Protons have a charge of +1. Electrons have a charge of -1. Neutrons are neutral, as its name implies. A stable ...

Electrons, on the other hand are elementary particles, meaning they’re not ... the researchers stacked five layers of graphene, each only an atom thick, in a staircase-like pattern.

Or, as Neil put it: “If a single atom was the size of a human being ... One popular theory suggests that the elementary particles themselves are made up of vibrating strings that are about the size of ...