He realized that Rutherford's model wasn't quite right. By all rules ... table of elements and tend to have similar chemical properties. Over the years other investigators refined Bohr's theory ...

When an electron dropped from a high-energy orbit to a lower-energy one, it gave out light with an energy equal to the ...

Nobel prize-winning physicist Niels Bohr described ... They all had magic numbers of neutrons. With the shell model and the ...

In 1913, Niels Bohr ... of that element. Therefore, electrons cannot be arranged at random, but they must have fixed levels of energy within each type of atom. Bohr's 'solar system' model of ...