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once you cross 20 elements,u go to the d-block...
the d-block elements are charecterised by 'VARIABLE VALENCY'
and have many valencies.......
eg..Mn (Z=25) has +1 to +7 valency
so u need to have clear understanding of the electronic configuration
stabilty due to 1.noble gas elec config
2.half filled orbitals and others
so it is better you grab a inorganic chemistry book and learn these things up.....
It's quite simple
Valency is defined as the no. of electrons in outermost sheel
to know the valency just write the electronic configuration.
if valence electron>4
valency=8-valence electron
else
valency=no. of electrons in outermost shell
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