The recipe required a small cloud of rubidium atoms, a class of particles that like to act in unison, and a large cloud of potassium atoms, which tend to be more independent. (sciencedaily.com)
Each molecule consists of one potassium atom bonded to one rubidium atom. (sciencedaily.com)
She cooled potassium atoms to — 459 degrees Fahrenheit, just 50 billionths of a degree above absolute zero, and trapped them in a vacuum. (discovermagazine.com)