It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons. The relative mass of a nucleus is ...

As an aid to understanding the atomic nucleus, physicists visualize it in terms of simplified models. A surprisingly fruitful approach is to regard it as a cloudy crystal ball ...

The electrons surround the nucleus in 3 dimensions but it is easier to show an energy level model in two dimensions like the model that looks like a target. This energy level model shows two electrons ...

He realized that Rutherford's model wasn't quite right ... give off energy and eventually spiral down into the nucleus, making the atom collapse. Or the electrons could be knocked out of position ...

presented a planetary model of the atom in 1911. In it, he laid out how atoms have a central, positively charged nucleus with ...

When two hydrogen atoms get close enough, the electron from each atom feels an attraction from the proton in the other atom's nucleus. This attraction pulls the atoms together. The electrons end up ...

He discovered the atomic nucleus and developed a model of the atom that was similar to the solar system. Like planets, electrons orbited a central, sun-like nucleus. Acceptance of this model grew ...

and why the traditional model of the atom is not correct. Electrons are unpredictable - we can't know the path that they travel. Most importantly - they don't orbit the nucleus. For the curious ...

The New Zealander had discovered the atomic nucleus in 1911 and further investigations by Bohr led to his quantum model of the atom where electrons travel around the nucleus in certain orbits. When ...