Atoms are very small. They have a radius of around 1 × 10 10 metres. This symbol shows that chlorine has 35 particles in the nucleus (protons and neutrons), 17 of which are protons. It also tells us ...

This image depicts the radium atom’s pear-shaped nucleus of protons and neutrons in the center, surrounded by a cloud of electrons (yellow), and an electron (yellow ball with arrow) that has a ...

The study is part of Henna Kokkonen's doctoral thesis. Credit: Tommi Sassi For the first time in almost 30 years, the heaviest nucleus decaying via proton emission has been measured. The previous ...

For four years, James Chadwick was a prisoner of war in Germany. When World War I ended, he returned to his native England to rejoin the mentor of his undergraduate days, Ernest Rutherford. Now head ...

A new measurement of the strong nuclear force, which binds protons and neutrons together, confirms previous hints of an uncomfortable truth: We still don’t have a solid theoretical grasp of even the ...

A new atomic nucleus 149-Lutetium, consisting of 71 protons and 78 neutrons, has been synthesized. A new atomic nucleus 149-Lutetium, consisting of 71 protons and 78 neutrons, has been synthesized in ...