Who postulated that matter is built from small Chapter 18 Atomic and Nuclear Physics Testicles? Democritus was a ..........philosopher? When was postulated that matter is built from small Chapter 18 Atomic and Nuclear Physics Testicles? What are the small Chapter 18 Atomic and Nuclear Physics Testicles called from which matter is built? What is meant by ‘atom’ in Greek language? What discovered that atom had a central Chapter 18 Atomic and Nuclear Physics Test called the nucleus?