THE ATOMIC NUMBER OF THREE ELEMENTS A,B AND C ARE 12,18 AND 20 RESPECTIVELY. STATE GIVING REASON , WHICH TWO ELEMANTS WILL SHOW SIMILAR PROPERTIES.
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The element which having atomic no. 12 and 20 because in their valence there equal no. of electron and valency is also equal and their charge is 2+
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A and C because they have same outershell electronic configuration....
outershell electronic configuration decides the properties of an elements .....
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