Question

From the following atomic number 9 12.16. 20.39, 47, 56 select a set representing a group of elements​

Answer 1

Answer

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.