Question

what is radial and angular wave functions

Answer 1

It is often useful to know the likelihood of finding the electron in an orbital at any given distance away from the nucleus. This enables us to say at what distance from the nucleus the electron is most likely to be found, and also how tightly or loosely the electron is bound in a particular atom. This is expressed by the radial distribution function. For s-orbitals, the radial distribution function is given by multiplying the electron density by 4πr2.

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