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 ...

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 ...

Thus when an atom absorbs or gives off energy (as in light ... But there was good evidence he was right: the electrons in his model lined up with the regular patterns (spectral series) of light ...

This video also goes the basic parts of an atom (protons, neutrons, and electrons) and why the traditional model of the atom is not correct. Electrons are unpredictable - we can't know the path ...

The idea was first cooked up in 1969 after a scientist named Roger Penrose noticed that a particle getting close to a spinning black hole gained energy. New Scientist adds that another scientist, ...

Students must understand atomic structure and how electrons are arranged. HS-PS1-8: Understand the composition of the nucleus of the atom to be able to develop models that illustrate nuclear changes ...