The atomic numbers of three elements A, B,and | vedclass

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(C) The electronic configuration of the elements is as follows:Element $A$ (atomic number $12$): $2, 8, 2$. It has $2$ valence electrons.Element $B$ (

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$A$ and $C$

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(C) The electronic configuration of the elements is as follows:Element $A$ (atomic number $12$): $2, 8, 2$. It has $2$ valence electrons.Element $B$ (atomic number $18$): $2, 8, 8$. It has $8$ valence electrons (stable noble gas configuration).Element $C$ (atomic number $20$): $2, 8, 8, 2$. It has $2$ valence electrons.Elements with the same number of valence electrons exhibit similar chemical properties.Therefore,elements $A$ and $C$ show similar properties because both have $2$ valence electrons and belong to Group $2$ of the periodic table.

The atomic numbers of three elements $A, B$,and $C$ are $12, 18$,and $20$ respectively. State,giving reason,which two elements will show similar properties.

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