Why Does D Orbital Electron Screening Effect Fall Behind S & P Electrons?

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Why is the screening effect of d orbital electrons less than that of s and p electrons?
 

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The screening of nuclear charge is due to the electron density which is nearer to the nucleus than the test charge (e.g. the valence electrons). Now, due to the higher angular momentum, the electron density of d-orbitals near the nucleus is substantially lower than for s or p orbitals. Hence less screening.
 
how is angular momentum related to electron density?
 
Abdul Quadeer said:
how is angular momentum related to electron density?

What property defines whether an orbital is s, p, d or f?
 
Its is the distribution of electron density around the nucleus