An atom is the smallest unit of an element that retains its chemical properties. It is made of protons, neutrons, and electrons. (Image: M ...

Bigger than a bacterium: comparing the size of a bacterium to that of a giant molecule made from weakly bound Rydberg atoms. The separation between the two atoms is about 1 micron. (Courtesy: Heiner ...

Enormous two-atom molecules about the size of ordinary bacteria have been made by two chemists in Switzerland. Comprising two caesium atoms, each "macrodimer" is about 1 μm in length – which is almost ...