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 ...

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 ...

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 ...