IONIC RADII
The radius of the ion while
considering it spherical is called ionic radius.
Positive ion is always
smaller in size than the neutral atom from which it is formed.
It is due to two reasons
In many atoms, outermost shell
is lost due to removal of one or more electrons
In positive ions no. of electrons are
reduced but positive charge on nucleus remains same. Therefore nucleus
powerfully attracts outer electrons inward resulting in decrease of ionic
radius.
Ionic Radii Of Negative Ion.
(Anions)
An atom gains one or more electrons to
form anion.
Negative ion is always
larger in size than the neutral atom from which it is formed.
In negative ions, no. of electrons are
increased but positive charge on nucleus remains same. Therefore hold of
nucleus on outer electron decreases resulting in the increase of ionic radius.
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