4 Atomic number of A and B are20 and 1. which
type of compound will be formed by A and B..
itwas from periodic table
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atomic no. of A 20
configuration 2,8,8,2
valency 2 it lose two electrons to reach nearest electronic configuration
atomic no. 1
configuration 1
valency 1 it gain 1 electron to reach the nearest electronic configuration
bond is CaH2
it is ionic
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