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2016-02-29T12:26:32+05:30

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Electronic configuration of A,B and c
A, 12 = 2,8,2
B,18 =2,8,8
C,20= 2,8,8,2
Hence, looking at the electronic configuration, A and C have same valency and valence electron, so they both will show similar properties.
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2016-02-29T12:29:38+05:30
According to me
atomic number 12=magnesium
atomic number 20 =calcium
these both lie in same table (alkaline earth metals )
so these two elements show similar properties
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I am still 5 th class
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