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THE SPACE QUANTISATION OF ATOM HISTORY:since bohr failed to explain how orbitals organise themselves around 3 dimensional space around nucleus ,a new theory called VECTOR ATOM MODEL explains the drawbacks of bohr's atomic model by introducing the concept of space quantisation.

principle the angular momentum is a vector quantity and hence its direction must be described to it.

According to classical mechanics the angular momentum is given by the dot product of radial vector and linear momentum of an electron revolving around the nucleus. Ĺ=p.ṝ