Orbitals

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• atomic orbitals are distinguished using quantum numbers

1. principal quantum no.

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   • determines the size and to large extent energy of the orbital
2. azimuthal quantum no.

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   • also called orbital angular momentum or subsidiary quantum no. it defines 3-d shape 
3. magnetic orbital quantum no.

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   • gives information about the spatial orientation with respect to std. set of co-ordinates 
4. electron spin quantum no.

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   • vector quantity - can have 2 orientation  informs about intrinsic angular spin 

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• the square of the wave function at a point gives the probability density of the electron at that point.

1. S
   1. 1-s
   2. 2-s
2. nodes

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   • region where probability function is zero
3. boundary surface diagrams
4. P
   1. 2px
   2. 2py
   3. 2pz
5. D
   1. dxy,dxz,dyz,dx^2-y^2,dz^2