According to this model, the atom no longer consisted of just electrons floating in a soup but had a tiny central nucleus, which contained most of the atom's mass. Around this nucleus, the ...

Discover the fascinating world of particle physics — the most fundamental building blocks of the universe and the forces that ...

But a new kind of clock, based not on electrons but on the nucleus of an atom, is on the horizon ... can be triggered using laser light. While most atomic clocks rely on changes in energy levels ...

Peik, director of the German metrology institute (PTB), is one of a handful of physicists who have spent the best part of three decades trying to make the most accurate ... by a new model: the ...

they were originally thought to bethe most minute particle in existence, with their name being derived from the Ancient Greek word for indivisible. A simple model of an atom shows a nucleus ...