Question
Why do elements in the same group show similar properties but the elements in different groups show different properties?
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Answer
The elements in the same group show similar properties because they have similar electronic configuration (having the same number of valence electrons) whereas the elements of different groups have different electronic configurations (different number of valence electrons) due to which they show different properties.
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Fe _{( s )} \rightarrow Fe ^{2+}( aq )+2 e ^{-}
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(Practice Activity Sheer -2 )
→The iron rust is formed due to reaction. Different regions on iron surface become anode and cathode.
Reaction on anode region:
$
Fe _{( s )} \rightarrow Fe ^{2+}( aq )+2 e ^{-}
$
Reaction on cathode region:
$
O _{2( g )}+4 H ^{+}( aq )+\ldots \ldots . .2 H _2 O _{( l )}
$
when $Fe ^{2+}$ ions migrate from anode region they react with.......to fomm $Fe ^{3+}$ ions.
A reddish coloured hytirated oxide is formed from. ions. It is called rust.
$
2 Fe ^{3+}( aq )+4 H _2 O _{( l )} \rightarrow+\ldots \ldots \ldots+6 H ^{+}( aq )
$
A way to prevent rusting..........
(Practice Activity Sheer -2 )
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