This is a Bohr model of the atom. This model was proposed by Niels Bohr in 1913. It is not completely correct, but has many features that are sufficient for a general understanding. In this representation, the electrons are rotating in a 2D plane unlike the Bohr model which suggests the electrons move in a 3D path around the nucleus. The 2D representation is for simplicity> A 3d visualization of p
![3D Periodic table of elements : A 3d visualization of periodic table. This 3d representation has a table view which shows initially and an atomic view. Click on each element to explore atomic view.](https://cdn-ak-scissors.b.st-hatena.com/image/square/d9dd337a4957d32607c23bc9c781b4d5698b8225/height=288;version=1;width=512/http%3A%2F%2Fgraphoverflow.com%2Ftemplates%2Fimages%2F3d-periodic-table.png)