s subshell is filled prior to 3d but on ionization, 4s electrons are removed first. 4s subshell is spherical hence has a greater penetrating power as compared to 3d orbital which is having a dump bell shape. Therefore 4s orbital is associ...See More Photo: 4s subshell is filled prior to 3d but on ionization, 4s electrons are removed first. 4s subshell is spherical hence has a greater penetrating power as compared to 3d orbital which is having a dump bell shape. Therefore 4s orbital is associated with a lower energy compared to 3d and hence the filling of the electron takes place first in 42s and then 3d. However when it comes to removing of electrons, removal takes place first in 4s, this is because once the 3d orbital has been filled its energy falls because of greater effective nuclear charge , making it more stable than 4s orbital. Hence, electrons are first removed from 4s.
Posted on: Sat, 27 Jul 2013 11:52:09 +0000
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