Periodic Table of Elements
This is a representation of Bohr model of atom. This model was proposed by Niels Bohr in 1915; it is not completely correct, but it has many features that are approximately correct and it is sufficient for a general understanding. Also in this representation I am rotating the electrons in 2D plane , that is also not correct to Bhor model , actual Bhor model suggests the electron path in 3D space. The 2D representation is just for simplicity.