Question

metal or has electronic configuration configuration to, it, work and maybe has A2, 8, 8, 2 which is more reactive

Answer 1

Heya user
Here is your answer !!

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Metal A has the electronic configuration 2 , 8 , 1 .
So this metal is Sodium ( Na ) .

Metal B has the electronic configuration 2 , 8 , 8 , 2 .
So this metal is Calcium ( Ca ) .

Sodium has one electron in its outermost shell whereas calcium has 2 electrons in its outermost shell .
There fore ,
It is easier for Sodium to lose its one valence electron than it is for calcium to lose its 2 valence Electrons .

So , sodium is more reactive than calcium .


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Hope it helps !!