From the following atomic number 9 12.16. 20.39, 47, 56 select a set representing a group of elements
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Correct option is
D
12,20,56
Option D is the correct answer as this option has the atomic numbers 12, 20 and 56, which represent the elements Mg, Ca and Ba respectively, which belong to II A group elements. Hence, option D is a set of atomic numbers representing a group.
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