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three elements A,B,and C have atomic numbers z,z+1 andz+2 respectively.among these c belongs to alkali metals.then atomic number that corresponds to a representative element is ?
C belongs to alkali metal have z+2 atomic no{(Z+2)-1} belongs to noble and so on {(z+2)-2)} belongs to Halogens .it mean atomic no. Z belongs to Halogens group
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