Bohr atomic model

Bohr atomic model - Now we at Chemistry Form 4: Chapter 2 - Bohr's Atomic Model, the information needed as below.

Introduction: Neils Bohr was born on October 7, 1885 in Copenhagen, Denmark. In year 1922 he won the Nobel prize for physics. Bohr was a professor at the unoversity of Copenhagen. Neils Bohr produced a theory about the structure of an atom based on Rutheford's Plum Pudding model. Bohr discovered that the electrons travel in orbits. Outer orbits could hold more electrons than the inner orbits. He suggested that when an electron jumps from an outer orbit to an inner orbit it emits light which called photon.



This model was created by Neils Bohr in 1915. In the center is the nucleus which is composed of protons and neutrons. It is orbited by electrons. The nucleus is about 100,000 times smaller than the radius of the atom.

Rutheford atomic model

Rutheford atomic model - Chemistry Form 4: Chapter 2 - Rutherford Atomic Model.

Rutherford bombarded a very thin leaf of element gold with a stream of high speed positively charged particles. These positively charged particles are alpha radiation from helium nuclei.

As expected, most alpha particles went right through the gold foil but to his amazement, a few alpha particles rebounded almost directly backwards due to same positive charge repulsion force.

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This proved that:

1. the atom had a dense but very small positive nucleus
2. the electrons were far away from the nucleus
3. the electrons were separated from the nucleus by a lot of empty space

Rutheford atomic model is one of Chemistry Form 4 notes, specially provide to you by http://chemistryform4notes.blogspot.com/