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Rank the 4p, 4d and 4f orbitals of increasing order to which the electrons present in them are shilded by inner electrons (1) 4d <4f <4p (2)4f< 4d <4p (3)4p<  4d  <4f (4)4d  <4p< 4f Answer is optiona (3) plzz explain
Asked by jhajuhi19 | 19 Feb, 2019, 08:04: PM
answered-by-expert Expert Answer
effective nuclear charge (often symbolized as Zeff or Z*) is the net positive charge experienced by an electron in a multi-electron atom. The term “effective” is used because the shielding effect of negatively charged electrons prevents higher orbital electrons from experiencing the full nuclear charge. 
 
Zeff = Z – S
S is the number of electrons between the nucleus and the electron.
 
screening effect is inversely proportional to nuclear charge.
 
This effect is mostly observed in elements having more number of shells particularly in f subshells and slightly in d subshell.
 
so, correct order is 3.
 
For more details refer the SLATER's Rule for calculation of "S" in avove relation.
Answered by Sumit Chakrapani | 22 Feb, 2019, 12:20: PM

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